I'm on a 2-3 day shave.

The 6/8 bismarck took off 4 days growth.

My hair is not very course but there is a fair amount of it.

When I think about it it shouldn't matter if you do the ATG pass on long or short hair. If you do an ATG pass it still has to cut the same amount of hair at the same density for the blade. The shank length is never seen by the blade as it only sees the hair directly in front of the cutting edge.

The only real difference is on short hair the blade will skip at 0 resistance, With longer hair it's going to treetop.