Did you think about a two stroke, like the 1.20AX?

Might be nice to have two different styles of power, rather than your primary plane with a monster YS and a backup plane with a less powerful OS 4-stroke.

After running my YS, I've propped my 120AX down to a 16x6. Gives me much quicker throttle response, still plenty of speed with ~10k rpm. Cost a lot less, too