I see alot of posts about many of the big two strokes being "luggers" and so far I am not convinced. Two stroke gas engine maybe. But so far I have found two stroke glows are just like the smaller engines they like the rpm. Seems like 7k anything is too slow. 8k or higher seems to be the sweet spot. I'll shoot for that.
The muffler that comes with all the glowengines is far more restrictive than the ones that comes with the gas engines because gas engines have a pump and dont need any muffler pressure. This quiet muffler that comes with most common glow engines OS,ST.... robs a whole lot of power atleast 500rpm compared to a free flowing muffler similar to the ones that comes with a gasoline engine. If you use a pump on any twostroke glow engine and use a free flowing muffler/ cannister or quiet pipe then you can run any prop size you wish. 6500-7000 peak rpm is no problem for a pumped 30cc glow engine.
My G3250 on a quiet pipe turns a APC 20x12, 20x8W or 22x8 @ +7500rpm.