Several things that might help: Run at least 15% nitro fuel for starters. (is this available?) and these engines need several gallons thru them before they truly produce their potential. Remember, winding up a 4 stroke is not really a good thing as the valve springs will only take so much.
If I understand, you are in the country of Georgia? You might consider a FAI engine that requires no nitro fuel such as MVVS, a 91 2 stroke should do the trick real well.
Just my opinion......