Once I get my broadheads, field tips, and stumping heads hitting to the same spot, I just make note of the nock and brace heights. I then just shoot. I still practice during the season, but it's always only one arrow at a time and either stumpshooting or shooting at tennis balls thrown around the yard.
I check my broadhead flight occasionally, using a dull practice head. I could probably get by without doing that, but it's good piece of mind.
I don't think you can bump a trad bow out of tune.