I always was under the impression that the tiller should equal. I don't know if that's the right terminology but you know what I mean. I just read an article online about bow tuning that says to shoot at your max range then back the top limb off .25 turn shoot again, turn it off another .25 turn and keep doing this until there's 1 full turn difference from the top to the bottom. Put the top limb back to where you started and do the same thing on the bottom limb. It said it will effect your groups and wherever you have the best group, leave it there. But then if you would measure I would guess the top and bottom would be slightly different. Is group tuning like this really a good idea? I know very little about bow tuning at this point since I'm so new to the sport but just trying to learn what's good, what isn't.