Did a comparison with FAI and 15% nitro fuel . On the FAI fuel with an OS A3 plug and a Master Airscrew 10X5 it ran a nice 13,000 but if a little glow heat was added it would rise several hundred rpms so I think a little more compression would sort out this combo. Switched to 15% Sig and ran a much smoother 13,500 very steady but didn't want to push it since this is a brand new engine. I will try some different combos on this theme and see what I can come up with. Either fuel started easy without even the need for an electric starter.