OK, I've been making the assumption that pull is directly proportional to RPM (example: that 4000 RPM will give you half the pull that 8000 RPM gives you). It's obvious there's a lot more at play here. I really appreciate all the responses. I'll be printing this thread out to add to my trimming an airplane file. It's obvious that coming up with a good throttle curve (or curves depending on the flight mode) is just as critical as the other trimming processes.

Jim