Well I have never owned one.. played with one or 2 at the field...

My main comment would be to change that prop and get something that will pull a bit better... ie: Xoar, Mejzlick, Menz, PT, NX, MSC, the list could go on. I like the Xoar for the price and performance, however the PT and Mejzlick are nice as well.

My other question would be do you need the weight in the motor for balance? If you dont I would consider sending it to RCIgnitions and getting it converted to EI and lightened up.. will help your overal weight which will also increase performance. He can prob knock off a pound or more. I dont know much about warbirds.. so this may not be a good suggestion CG wise.. others will have to chime in.