I also do both.
Often I will shoot through the paper just to make sure I'm not way way off, then I go outside and bareshaft at 10, 15, 20, 25 yards etc until satisfied.
Thenj I check tune with broadheads. bareshaft, field point, and broadhead should shoot the same spot to 30yds, but most importantly field points and broadheads .... bareshaft is just a tool to make that happen.
I do find though that no matter how much tuning, once I get out past 30yds, my broadheads tend to hit a couple inches lower. I think its because they are longer than my field points, and that throws off my point of aim slightly for gap shooting.