I spent yesterday switching props, and I think the 22x20R / 22x18F combination works very well with the Kontronik motor and the V4 Drive.
The Kontronik motor seems to add a lot of speed range, which makes these props much more useable in windy conditions.
According to my ESC log I am pulling a maximum of 87A with these props, and and I'm using about 3000mah for the new AMA Masters pattern, which should be comparable to P15.
See attached for a screenshot of the throttle curve that I'm now using. This curve gives me a very linear response from the Drive. Right now I don't know if the uptick off idle is actually needed, With my V3 Drive, this uptick was about twice as much, and I just kept reducing it until I was happy with the throttle response during stall turns.
Brenner ...