It is not uncommon for fixed blade BHs to group just a little off from your field points. This is not necessarily indicative of a bad tune, just different flight characteristics.

A 1" point of impact change is more than acceptable out ot 30 yards. Just move your sight and go hunting.

The one thing I will caution is that if you are continuously moving your sights to hunt then target shoot, I would ensure that I left at least 1 day in between each event to make sure that when I moved my sights back, the BHs are still hitting where they should. The foam target or bale does not care if you miss the X, but you owe it to your prey to ensure a quick clean kill.