Actually, my experience with Monocoupe flaps is that they are very ineffective, without much pitch trim change at all. Just how different airplanes react can be seen...I have Sicroly and Curare, which both go nose up with flap deflection, and quite markedly so. My 190 has minimal trim change, nose very slightly down. And I'll bet others will have the same aircraft with different reactions. I doubt that balance location has much to do with it, my full size experience (limited) was that I had to trim nose up with flap deflection (ie airplane went nose down) to maintain circuit and approach speeds, so even in the full size world, different A/C will exhibit different responses. The biggest effect on flap response is probably airspeed, for Curare, as above, if the speed is a bit high nose goes up, bring the revs down and as the model slows the nose goes slowly down. Something to try, anyway.
Evan, WB #12.