Have you tried different props on the escapade? I was flying a new Big Stick 40 with a thunder tiger 46 on it and was impressed with how fast it flew with an 11/5 APC prop. On landing I struck the prop tip and swapped it out for an APC 10/6 and man was that plane slow with the 10/6 on it. I wouldn't have believed what a difference it would have made if I hadn't just seen it with my own eyes.

A friend from about 10 years ago had a GP Sportster with an OS SF46 IIRC and that plane burned holes in the sky.