RE: GWS Cub with custom paint on 3s.
The 7x6 does allow the motor to live, but you lose some prop efficiency by going to the smaller prop. I already had some C (8.6:1) gearboxes, so I just went ahead and used one. The gws ips motor's efficiency actually improves with higher voltage, going from low 50% range to low 60% range, just so long as amps are kept in the sub 2 range.
Dean