I used to up side of the flaperon on my GT Giles 202 (pattern version Gator)it actually mixed with elevalor, the end product is a slower approach with a fairly high nose attitude and usually require to apply some throttle, I have started using this to shorten my roll out at funfly since there field were quite small....it also work very well on the funfly 3D aircraft by having a approach that is very steep to a smooth landing.

You should tried at altitude first to dial in the elevator, I could look at my programs (JR) but you don't need that much deflection to be effective.

Daniel D.