My TF 1/7th scale mustang ARF climbs like crazy. It takes about half of the down trim to make it fly level. I added down thrust which helped some, but the stab to wing angle is the real culprit. I might have to change the wing in an effort to fix it. The problem really shows up when taking off and landing. With all of the down trim, it wants to nose over, but up elevator causes it to try to take off too soon, or lift off again when you are trying to plant the tail on landing. The stab needs to lose a degree or two of positive incidence.