RE: Best prop for.....
10-6, 10-7, 10-8, 11-4, 11-5, 11-6, 12-4, 12.25-3.75
With the 10-6 & 11-4, you would have to use carefull throttle management -- no prolonged periods of full throttle in level flight.
Best overall choices --- 11-5, 11-6 or 12-4