trainers can handle a higher wing loading due to the high lift airfoil an old guide would be one pound weight per 100 square inches of wing area.you could try using a heavier spinner or nose wheel or even a weighted prop nut,weight needs to be as far forward as possible.hope you reduce the throws on the larger control surfaces as things could git touchy ,that and a rear cg is a disaster waiting to happen.most trainners will balance on the main spar which should be the thickest part of the wing.