Jaydee, your theory that two point it best done with toes forward conflicts with every reference I can find, and it conflicts with my own experience.
"you'll be less likely to end up with them pointing too far out and result in having the backs of your legs against the horse and your heels digging in its side"
If George Morris, Harry Chamberlin & VS Littauer say you can have your toes up to 45 degrees out without that happening, and if I (as a relatively inexperienced rider) can do that without it happening, then what is your basis for that statement? My toes stick out 30-40 degrees. My heels do NOT dig into my horse's side.
I do not ride with spurs, and I have no idea if Gigembritt plans to use them or not. But the US and European cavalries rode over rough country and did some fairly extreme riding - with spurs.
The Portuguese Army:
Guy V. Henry, Jr., President of the Fédération Équestre Internationale (1931–1935, according to Wiki):
And just because it is an interesting picture...: