Both pf the g26's I have from Ralph turn an 18x6 Mezjlik at 8000, one I bought directly from him and another was a brand new from Horizon that was sent directly to Ralph and then sold by the person from my club who never ran it. I'm sorry I did not see the rpm figure before so I do agree that you are not broken in yet or the prop is a wider blade than the Mezljlik. I'm not familiar with the MAS props in that size.

I have yet to see an engine that did not need some kind of curve to realize a nice change in rpm from idle to full throttle and that's with a good throttle servo setup to get about 125% resolution on both the low and high sides