FWIW, here's some thrust numbers I got off my DA50's last night. Both engines are broke in, Slimline Pitts mufflers, and running Mobil MX2T oil at 32:1. Temps were 80 degrees or so, low humidity. Thrust was measured with my digital fish scale.

Bolly wood 22 x 10 turning 6600 pulled 23 lbs + or - a bit

Bolly wood 23 x 8 cut down and balanced to 22 x 8 turning 6780 pulled 23 lbs. + or - a bit

The 23 x 8 uncut was only turning 6300 and I didn't like the flight charactoristics at all. Too slow and too much load on the DA IMHO. It works great on my WH 28% Edge cut down to a 22 x 8.