RE: Seagull Ultimate
One thing I noticed on mine as I tried a lot of different CG settings. If I got the CG to far back the plane would not stop instantly after a aileron roll. It would wobble a little bit after I centered the aile stick. I fly/flew all my GB Ults at 3.5" with the plane inverted using the lower wing at the fuse. For some reason the SG did not like the CG this far aft. It was not snappy by any means but was not as solid as I like. Just a thought on your aile problem. lol
David