I use a Menz 22x10 ultra @ 7100 rpm on my G45.
It is in a 19 lb Christen Eagle and performs very well.
Max power(torque) is in the 6700 to 6800 rpm range and I prefer to stay on the high side of the power curve.
I also have CH ignition on my engine and a Bisson muffler with the crimped ends cut off.
I use Amsoil series 2000 2 cycle racing oil mixed 50-1.
Thanks
John