So how is being blocked? Is the sight too far off on the horizontal or is it too high?

If it's behind the riser in the horizontal plane then you probably need to move your rest away from the sight window. It depends on your bow tuning. Have you tuned the bow (paper, walkback, etc)?

If it's too high then you most likely need to raise your anchor point, moving the peep and/or kisser button down the string accordingly.