I agree that you should learn to tune it yourself.
Bareshaft, or walkback, and then with broadheads.

You can only be guaranteed that the bow is truly tuned for you when you are the one shooting it. If you want someone else to precisely tune it for you, then you need to be shooting it, and he needsto stay with you throughout the session to tweak it between groups. If he thinks he can get a precise tune at an indoor 20 yard range, find someone else.

You should be able to get your bareshafts and fletched arrows hitting the same point out to 40 yards. Your groups will be bigger than at 20 yards, but they should center in the same spot and be the same size. Then shoot fletched field pointed arrows against fletched broadhead tipped arrows. You should have the same result.

You'll see a BIG difference when you finally get it dialed in. Then you'll be spoiled and always want ti perfect.