Secondly, I understand that string angle does not change on uphill and downhill shoots but anchor points do. The sharper the string angle the harder it becomes to maintain proper anchor and form which is directly related to how accurately you shoot your bow.
Anchor points should not change at all uphill or downhill if you are using proper shooting form and technique regardless of the bow. What messes up the shooters anchor on uphill and downhill shots is raising or lowering their bow arms towards the target and then drawing. Instead they should draw the bow level, anchor in, then pivot at the waist to ensure they are properly anchored and that their upper body is in proper alignment.