Tuning Question
 

I was shooting field tips fairly accurate. I had good groups and figured I would need to practice with broadheads. I shot same size weight and they would shoot low. I moved my knock position down a little and now it shoots much better. What else can I do or should do to get a better feel for what is the problem? Would moving the rest higher fix it better?

RE: Tuning Question
 

You said it shot good when you moved the nocking point. What is the problem now?

To tune a broadhead, I like to shoot through paper to get nock height correct. Then I group tune at 20 and 40 yards for horizontal adjustsments on the rest. If your spine is borderline, or you don't know, it might be a good idea to bareshaft tune, adjusting draw weight when doing it. (don't use broadheads when bareshaft tuning.)