To correct the weight difference in the back, I add masking tape to the shaft in amounts equals to the fletching I use. It takes very little to match the weight of feathers. You don't have to match everything perfect when bareshafting. Getting close will generally get your broadheads flying real well.

When bareshafting with a traditional bow I don't go past 20 yards. When using a compound, I make sure I can get back to 40 and still have the bareshaft grouping with the fletched. I don't worry if it's off slightly vertically, but I want the left and rights to be nonexistant. For this kind of accuracy at that distance, you usually have to be willing to fiddle a bit with tip weight and draw weight. Just make sure your arrow length gets you close at 20 yards and it's easy to fine tune with the others.