I've gone over my bipe with a fine tooth comb and I now think that I have everything set up correctly. While doing this I found that a piece of monokote used for trim on the right side of the top wing wasn't ironed down well and was probably acting as a parachute when trying to turn the plane. I've straightened out the elevators and double checked the CG. Tomorrow I'm going to fly it and see what happens. Wish me luck. I'll let everyone know what happens, and once again, thanks for the help.