That's our man - Helmut, aka "Ziggy". I didn't watch the whole video, but I'd imagine that you got most of the details.

http://www.teejet.com/media/c2d13dca-93ba-4e4b-a2c9-70737e951943-CAT50-US_LoRes_p023.pdf

Here's the Turbo Flood chart. Beware the rates are based on 40" spacing, so you'll be looking for something that delivers 7.5 gallon at your speed and pressure. Confirm this with someone other than a dude on the internet.

I'd probably run the TF-2.5 (brown) because I'd be wanting to keep my minimum at 40 psi. These droplets are considered Very Coarse at below 40, so I'd want to be running at 40 - 60 psi...

Luke