Most of this is bullshit because of the placing of the weed hatch and its design.
The sizing of the prop is or should be determined by the sfc of the engine in normal use. If however you spend a large mixture of time on rivers, then the torque band of the engine and its brake horse power must also be considered. All of the calculations give power absorption in relatively deep water and do not take into account the actual boat designers preference to his swim.
This is a very ongoing question.
Due to circumstances, I am now available to be back on the site. Anyone who knew my wife, Ann James, should be aware that she died suddenly in March this year.
Bless you all.