For me, as a hunter using a behind the nock release point and a drop away rest, not a target archer, I tune my bow to get a perfect bullet hole from 5 feet away from paper. As long as my arrows spin well, I believe this gives me the best potential accuracy with fixed, mechanical or field tips out to the distances I shoot.

I had a pro-shop like you mentioned once. Guy put the rest on, took it out to shoot at 20 yards, bullet hole, said it was tuned. I walked up to the paper, shot, TERRIBLE tear. He looks at me and said " you can' t shoot paper that close. You gotta give the arrow time to settle down" . This is the guy doing the majority of tune work for everyone in town.

I went home, tuned my bow myself and have never looked back. Just cause they own a shop and act like they know it all, doesn' t mean they do.