RE: UP AND DOWN
I suppose throttle curve could be involved in the solution. Is it happening in Stunt or Normal Mode or both? I had an issue when I first got the T-Rex because I put the throttle with a min stick of 60% and a max stick of 85%. That combined with a liner pitch curve made it a bit unstable. Try putting a little exp in the pitch curve. Unfortunately I'm kind of shooting in the dark but that would be my strategy. Good Luck.