IMO, C - that applies more to shooting a recurve or longbow off the shelf than it does to elevated rests. Nocking too low and having the feathers slam into the shelf can bounce the nock end of the arrow up and make it nose dive at the target. That problem is easy to isolate using bare shaft tuning. Bare shafts will be hitting higher than the fletched shafts.
Shooting a good elevated rest, one that either gives you fletching clearance like the Star Hunter, or one that moves out of the way like a flipper, that problem is practically non existant. I doubt there are very many folks still shooting those old rubber stickon rests on their wheelbows any more

, and I guess I' m one of the few boneheads left that' s still got a bow set up with a springie rest.
Still, a fingers shooter will generally need a slightly higher nockset than someone shooting a release. And, I think, it' s just as important for a fingers shooter as it is for a release shooter to pull into wall and then try to pull thru it on release to make sure the back tension is right and there is no creep. It really makes for a clean release too. I' ve got my draw length adjusted so I' m right at the edge of the wall when I' m at anchor, then a little extra back tension and my fingers just quit holding the string when I hit the wall.