I used a 13X6 APC on mine on a Matt Chapman Cap580 and it seemed to be the perfect match. Lots of pull, 2 vertical snaps and it still kept climbing, excellent straight line vertical speed.

It should do well on your plane.

If that is the cool power 15% green fuel then that is not enough oil content. The green stuff is 17% synthetic. CoolPower does make a 15% heli blend that is 20% oil though.

YS engines work best on a minimum of 20% nitro and 20% fully synthetic oil and if you really want to wake that engine up give it 30% heli fuel from CoolPower (I think it's pink, I haven't used it in a while as I went to mostly gas). Also, even though the YS manuals tell you a castor blend of oil is fine, I found that castor tends to gum the regulator which will give you mid range problems so try to use all synthetic oil