I've never understood the desire to bare shaft tune.  Who cares where a bare shaft hits.  You don't practice or hunt with bare shafts.  I paper tune with the arrows I intend to shoot.  It may not be perfect, but then again, neither am I.

Odd man out here. Before changing an anchor point to nose tip, I had practise sessions at least once weekly with bare shafts only. They sure magnified form issues and shooting bare shafts at 3D's wasn't out of the question.