My Futaba 6 channel 2.4 has the same deal. Flaps up or flaps down. When I flew the RV 4 for the first time I put the flaps down and I knew it was going to ballon up but I didn't think it would be so significant. I might have to try to mix the flaps with the throttle and see how it does if this is possible. Any other suggestions would be greatly appreciated.
Thanks

chopper man