If the arrows are hitting left, it would seem they should be a little softer spined. I noticed a huge difference in POI with my one longbow that was not cut to/past center. I had to go almost 2 spines softer to get it hitting where I wanted. You siad you haven't bareshafted it, and you don't give any specifics on the arrow, but unless you are already really heavy up front it would be very easy to add some more point weight to see if that brings the POI back to the right. I'd say "overdo it" if possible. If you can add enough weight to get them hitting too far to the right, you will have a good idea what weight up front will put it center.