Barn door vs. strip ailerons

I always thought barn door ailerons were more efficient than strip ailerons. Not sure now.

A Sig Kadet Senior kit was flown in original configuration with strip ailerons. Aileron authority was good. An ARF wing with barn door ailerons was installed for other purposes. A minute into the first flight it was realized that aileron authority was not very good. The clevis was moved in on the horn and retested until the last hole was reached.

Aileron differential (more up than down) was added to the barn door wing by changing the horn position in the servo post. No additional aileron authority was observed.

Current setup
Strip aileron wing – hinge to clevis 1”- area = 60 1/2 sq in. - No differential
Barn door wing – hinge to clevis 15/16”- area = 87 sq in. - Slight differential
Servo horns are in the 1/2”hole on both wings.

Maybe more important it appears that the barn door wing almost requires rudder to turn but the strip aileron wing didn’t even hint at needing rudder in a turn.

It seems that what I have thought for years about barn door aileron efficiency may not be correct. Can anybody shed light on the observations?