Xanatos,
thanks for stepping in here. I did not know how to set up a Hitec transmitter.
On my Futaba I set up a very small percentage of flaps with the elevator, otherwise it does some crazy things. Inverted flight is interesting also. A touch of down elevator makes it climb like crazy. Also outside loops are much easier when the flaps kick in negative with down elevator. My Tx also has a switch to turn of the mix so you can get straight action with the elevator.

I have a question for you. When I took flying lessons (full size) and I added flaps for take off or landing I had to add some down elevator to keep the nose from balloning up. On my model, when adding flaps I have to use up elevator or it pitches down hard. Why 'dat?