Hi,
I have show time with a YS110 as well. My engine is very well tuned and it turns 16*6 APC prop 9.800 rpms at a guite rich setting (but I do not mount the exhousts to my YS engines to get more power)
This is a little bit too much rpm so I go up to a 17*6 on which I get 8.800 rpm.
Fuel is 20%-20% omega
I hope it helps