First off, nice to see another Michigander here! Length of veins is dictated by many things. For example...I shoot a 410 grain arrow 280fps using a 3 inch straight feather.
Target tips are no worry...I don' t have a big broadhead trying to steer my arrow. But when I put on a 2" cut on contact broadhead those 3 inch straight feathers aren' t going to cut it.
Come hunting season, I' ll put a 4 or 5" hellical on and the added drag and stability will straighten those big heads right up.

Those big, hard hellical fletches are notoriously hard to get clear of the rest unless you have a drop away though.