its not that complicated
there are lots of variables,,but try to keep it simple
if you change everything at once,, who knows what the issue is
I don't think you said how long your arrows are,, or what your draw is,,,
I would start there,, get the arrow to shoot as good as you can first
then adjust the bow
I would try a 50# spine arrow cut to 28 inches or 29 inches,,,
and move the nocking point up first,, that should do it,,
unless the tiller is way off,,
an unbraced,, braced,, and full draw photo would help us "guess" especially the braced for me