When I do vrt rx for someone who has been seeding flat rate with a 2630, often the memory needs to be cleared by a jd technician.
Control is done by the SeedStar 2 controller not the 2630.  The 2630 is VT and does not control the planter the SeedStar 2 does and the 2630 it is merely the GUI for the SeedStar 2.  Saying the 2630 controls the planter is like saying your computer controls NAT while in reality, your computer is a GUI for NAT via an internet connection and the NAT server controls the NAT website.  As for the reset procedure to clear the memory on the Seed Star 2 systems it is rather simple: change the planter drive type.  Some older versions require the planter drive type to be changed via the diagnostics code rather than just selecting it in the setup menu; luckily, both procedures are easily done by following the operators manual and do not require a Deere tech to change.

I was told that when a monitor is first connected to a planter it learns shaft rpm ranges for the first 10 minutes. So after we clear the memory we vary travel speeds and seed rates up and down multiple times to learn maximum shift rpm ranges.
What you are describing is establishing operating range of the VRD motor since it has flow limitations to keep the motor in the function speed range.  The rate and speed ranges are used to establish the minimum speed for the selected gearing.  If when gearing is changed the SeedStar will update the minimum planting speed based on desired population and gearing so that the VRD operates smoothly.

Interestingly enough in SeedStar 2 manual under VRD Overview it states that a nominal flow range of 1-8gpm is required for each VRD motor and to quote the manual:
Variable drive system performance is marginal at motor speeds less than 18 rpm (usually around two miles per hour at low population rates). With motors operating at low rpm or low oil flow, drive may be erratic, resulting in inaccurate population and will stop at 11.5 rpm (usually planting speed below one mph). Planter monitor will not provide a warning when system is operated below two mph.
Some would describe this as "an extremely poor vrt system" since it can not go down to near 0 population and near 0 ground speeds and requires mechanical changes to the machine via gearing to get a wide operational range out of the machine.