It is really hard to tell without seeing you shoot. In my experience, left, right hits are ALMOST always form related NOT spine related. A person with good repeatable form will be able to shoot NEARLY any spine and hit very close to where they are aiming. The arrow may not fly well or may slap the bow but it will hit close. But if you are collapsing on the shot, flipping your string hand out, not getting good alignment, etc. you are far more likely to hit either left or right depending on the form errors.
My advice is to look to your form first. That is the largest variable in archery by far!
Arne