I already corrected the lateral balance. I only added a tiny piece of lead to the left tip to balance perfectly.

When doing a 45° up line and 1/2 roll, it instantly starts to drop when inverted. I am moving the C.G. back 1/4 inch at a time. I think Great Planes has a VERY conservative balance point in the instructions. It looks like I will be well aft of the recommended position.

A very good flyer/builder in my club is helping me. He says that the yaw problem will be reduced with an optimum C.G. position but it appears that I still need a little right thrust.