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| Ah good stuff for the speed. That's usually the main issue when it comes to having a clear benefit to switching to a double-down style spray. And yeah, Tip Wizard on the site has a tougher time viewing on a phone (apps are available for the phones though).
As it happens, since you are spraying a lot slower than a fair bit, so you might be in the situation that you'd do a perfectly acceptable job with a single tip that'd produce kind of the same droplets as the two nozzle combined.
So, if you were switching to PWM for the 20GPA work at 8mph, an -06 would be perfectly suitable to do the FULL 20GPA rate, so I wouldn't likely bother swapping to a dual nozzle. If you ended up needing to spray around 10-12mph for your 20GPA work, that'd shift it to an -08 nozzle size where things start to get a lot coarser a lot quicker. Even with a flat fan -08 nozzle, you are still getting coarser, but still getting a fair bit of drift (which would still be waste during fungicide spraying), so you lose on both ends.
In your case, I'd be looking at something like an SR110-06 by itself, which is still able to provide that solid mix of finer spray without being too fine to cause a ton of driftable fines. (I attached a chart off Tip Wizard on the computer). Again, I'd be focusing on trying to keep the driftable fines (%<141µ) lower than 15% even in a fungicide application, and trying to maximize the coverage factor (%<600µ) over 90% if you can manage it. The SR110-06 by itself would be in that sweet spot to do both by itself.
For an example of what even an ER110-15 would look like, which is as fine as it gets for that size. This is often what some guys are effectively forced to use just to be able to put the flow out of their PWM system for 20GPA @ 15mph. It is straight up almost 3 times the size of what you are using at half the speed. The driftable fines are OK at <12% driftable fines at 65PSI, but the coverage factor is where you see that shift of losing the finer droplets that still make up the bulk of your coverage. And this is the finest a nozzle can really get in that size. It would be a huge shift to coarser spray even going to the first stage of drift reduction nozzle (the SR series), cutting the coverage factor down near 20%.
All in all, you are correct in that an MR110-025 on non-PWM + MR110-04 on PWM would be a solid setup if you were going that way. I might even be OK with even considering a DR110-025 if you wanted to try go for the same dynamic of a coarser nozzle upfront of the pulsing one. (That'd be more of a trial on your side though). With the MR pair, on average, your driftable fines would be in around 10%, which is a tad lower or the same than a single SR110-06 (depending on pressure). For coverage factor, it would be in around the 93% coverage factor, which is a tad higher as well. It'd be a tad different, but if someone was setting up on a brand new sprayer, I wouldn't be necessarily confident enough to say there will absolutely be enough value in the stacked body setup with those two nozzles compared to a single SR110-06. If it was something like comparing to an ER110-08/SR110-08 or upwards of like an ER110-15, then absolutely makes sense. Since you are going slower, you are in a position that you can use tools in your toolchest that another applicator that is spraying faster physically cant. Since you already have an MR110-04 on hand already, then its not so much the same situation of having to buy two nozzles to do the setup. Whether it'd be the SR110-06 or the MR110-025, you'd still be short one nozzle only.
As far as flexibility for other applications, if you wanted to be able to have a non-PWM nozzle that can put out ~10GPA in a medium-coarse spray suitable for contact herbicides/fungicides, then the MR110-025 would be a good fit. If you were finding a need for a pulsing 20GPA nozzle at 8mph for contact herbicides (or even systemic herbicides at like 35-40PSI), then I might look seriously at the SR110-06 as the fill-in nozzle. It'd depend on whether you expect you might need the nozzle you pick up to do any other work on the sprayer, and where it provides the most benefit.
So, if you were going faster than 10mph, I'd say you are 100% good in getting an MR110-025 (or DR110-025) and using the high flow mode. As you travelling slower there might not be the same benefit in comparing them, but there still might be that nominal benefit. Technically you could even use a double down adapter on your PWM outlet (or rebuild the turret to have it built in without needing an adapter) and use the MR110-04 + MR110-025 nozzle combo on your PWM so you maintain the benefit of individual nozzle control and turn comp (if you have that already).
With your situation, you have a few options, so I hope I didn't confuse it all by throwing it out there, but there might be some benefit with your dual setup, but it wouldn't maybe be the like 10-15% gain in droplet deposition that swapping from an overly coarse nozzle to your setup. (It might still have benefit, but I haven't seen enough testing of exactly that baseline to dual setup to be 100% confident in huge gains)
Let me know if that makes sense,
If two nozzles paired produce the same droplet size(s) as a single nozzle, it doesn't really mean the two would be significantly better application than the single nozzle. While there might be some change in dynamic that'd benefit the coverage, in the studies, the baseline 'single' nozzle was starting to get nominally coarser just due to the size of the nozzle. So, if you are able to have a nozzle size (usually 110-06 and smaller) and still be able to hit your rate with the speeds you are going, I'd imagine that'd be
By having two nozzles, it doesn't necessarily mean it is better than one nozzle naturally. Only when a single nozzle can't get you the desired spray quality would there start to be a significant benefit. (e.g. using any nozzle larger than an -08)
So, as you are going only 6-8mph, and I didn't catch your full flow rate.
 (ER110-15_20GPA_20INCH (full).png)
 (MR110-04_10GPA HALF_8mph (full).png)
 (MR110-025_10GPA HALF-NON PWM_8mph_20INCH (full).png)
 (SR110-06_20GPA (full).png)
Attachments
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 ER110-15_20GPA_20INCH (full).png (61KB - 321 downloads)
MR110-04_10GPA HALF_8mph (full).png (59KB - 319 downloads)
MR110-025_10GPA HALF-NON PWM_8mph_20INCH (full).png (53KB - 305 downloads)
SR110-06_20GPA (full).png (53KB - 334 downloads)
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Nozzle for fungicide
