JeffB is right on. Listen to him. Offset grips can easily make for mis aligned pins etc. And I totally agree that today's single cam bows group better with stiffer arrows.
Paper tune your bow from two seperate distances for a starting point.
Then group tune your arrows.
Set your sights, and I bet they still won't be lined up. I have never had a bow line up totally either. At least a newer single cam.