Lateral balance is right on as is the CG. I have plenty of expo on ailerons and have ruled out the possibility of accidentally moving the stick side to side. If I loop with the elevator on high rates I don't see the problem and I think it just happens on bigger loops when I am on low rates with more speed coming out the bottom. When I go to pull up to level flight the left wing does a violent drop 45 degrees and sends the plane screaming for the ground. I have a reversing y harness on the elevator servos and maybe this could be the problem but I checked it with my digital inidence meter and I have the same up and down throws on each elevator but maybe it reacts differently in flight.