Adam,
I will try my best here. Sounds about the same problem I had on my N5C. Take your settings on the tail and set back to factory, make sure you wright your current settings down just in case. Adjust you gyro gain first until you have a wag back down by 3 points. I do this test here with hard nose over flips. Step two adjust your heading hold gain on beast until wag then back down by one. If you can fly backward circuits fly upright backwards in a fast huge circle to insure you settings is correct on this one. Pot 3 is user define. I used it to keep the bounce back out of mine one tick to the left. I used my Rudder ATV'S to get piro to rotate left and right consistent. Don't worry if your numbers doesn't match because of torque and counter torque. My beast flys awesome with this setup. Let me know how it goes and will scratch my head with you to get a solution. The Rock...