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" It seams that no matter how big a 4 stroke engine I use, It seams like it just cant keep up with a two stroke that's half the weight and twice the power.... "
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How big a four stroke are you using.....?....

The 1.20 Pumped OS, and even the 1.20 Magnums pull about
the same size props, and at the same RPM as the 1.08 and
1.20 "tractor motor" two strokes. ( the 10K range).

The little .52's, .53's, and .60 four strokes don't make much
power....that's for sure....but up in the 20cc range....

....they're Brutes.....especially if you put the nitro to them.