My Falconar had large control surface gaps , ( built to plans). I had a slightly heavy left wing. Install a fixed trim tab on the aileron to fix. Few years later I added gap seals on all the control surfaces and it was a different airplane. The heavy ailerons went away, now almost as good as an RV-4. Also now the right wing was heavy. Took the trim tab off and it didn't have a heavy wing. Rudder and elevator seem about the same. The big surprise was it picked up 17 mph in cruise.