RE: Having trouble grouping
Not to be blunt, but its one of two things; You or the bow.
Were you shooting well before, or have you always had some trouble grouping?
Tuning does help your bow group better by being more forgiving, but you could put a totally out of tune bow in a shooting machine and shoot the same hole all day long. Not to say its definitely you, but if you are ALL over the place, its probably not just the bow.
Perhaps you can post a picture of your form, and we can see if anything is blatantly wrong.
Also, let us know your setup; Bow make and model, draw length and weight, arrow type, spine and length, rest, etc...
Perhaps you changed something on your bow recently as well...???
Many things could be causing what you are experiencing, so you will have to elaborate. Hopefully we can help you, but if not, your best bet would be to visit a pro-shop.
Best of luck to you, hope you can get it figured out.