Pitcrew 232,
I have a lot of planes with engines from 46 to 90 2 stroke. I find the OS #8 is the King of the Hill for performance using Wildcat fuel with 10% Nitro and 16% Castor. I always try not to lean the high end out too much on the ground, as it may lean out more once in the air and die. I'd rather see a trail of blue smoke from being too rich, than being too lean and over heating the engine. Good luck.

"Keep 'Em Flying!"
Flak