Dan, that's if you are paper tuning. I'm much less concerned with the tear, than I am with where the bareshaft strikes with respect to a fletched shaft. If I (left handed shooter) see the bareshaft striking to the right of my fletched arrow, I'm stiff. If it lands to the left of fletched arrow, I'm too weak. I will "rough it in" at the 7 yds or so I can get in my shop and then go to the field or range and do it at 20 - 25 yds. I've never had a broadhead fly badly once I get bareshaft and fletched landing together with field points.
Bareshaft planing and paper tuning both work, obviously, as long as you are comfortable with your tuning method.