I've got a new 26GT2. I've completed the break in w/ 30:1 per the manual and I've run about 400ml of 40:1 fuel so far. Low end setting seems right, high end is set for max rpm per PRME instructions, and ignition is per spec.
I am only getting about 5200 rpm on a Zinger 18x12 in a pusher configuration at WOT. I know this is a little more prop than recommended. Even so, 5200 is only about 1.0 HP on the MVVS prop power calculator.

Any suggestions?