I am trying to figure out a trimming problem that may relate to split elevators ie each side on a different channel. In doing loops or half cuban 8's or sharks teeth type maneuvers, when the plane comes over the top it tends to fall off to the left as it goes inverted. I am trying to figure out if there is a small difference in the elevator sides such that when I give it up to come up into a loop or over into inverted, it goes to the left. I hope I am being clear enough. How do I tell which elevator half my be pulling up more than the other and causing the plane to deviate off course ?? I cannot see a noticeable difference in the two elevator sides but the plane definitely goes over to the left as I pull through the top of a loop. Any suggestions

Bill