No problems balancing here either, hmmmm. I went with an AON T2415-4900 and a Cobri gear box. The motor weighs the same as the Park 400, but the gear box is a little heavier than stock. It helps take heat out of the motor, almost like a heat sink though.

I prefer the gear box set up to an out runner for the simple reason that I can vary my setup to suit my flying that day. If I get up early and want to 3D I go with a 6.6/1 with a APC 12x6 SF. On windier days or if I get up late I switch to a 6.3/1 with an APC 11x7 SF. It's much faster and really penetrates the air.