I use the 1" Diameter 2" pitch rule too - there aren't too many surprises using this approach. Sean, you make a good point on the profiles of APC props. The "Pattern Profile" actually kicks in on the higher pitch 13", 12" and 11" props; for example, the 13x9 and 13x10 are "Pattern" whereas the 13x8 is "Sport".

I have found that loading through this "Pattern/Sport" divide is still fairly consistent with expectation, at least in the 13" diameter range.