So, it looks like the .91 may be too big. I really didn't want to take it out of the UCD just yet, anyway. I keep seeing numbers on the West being such a powerful motor, but the RPMs with the 12.253/75 props are only running around 12500. that's what I'm getting out of my Irvine .53. What makes the West so much better, other than that it fits the plane well?