Struggling Part 2

It would seem that my off -spec bow and mismatched arrows are not really a cause for my poor groups.
Recently I have been able to shoot several days outside and get a feel for longer distances again.So far I have spotted a couple of things about my shooting.
1) I cant the bow. That has been something I have been guilty of since I started with recurve way back in 1982. It shows up after I have reached my anchor points and am settling on the gold ready to finish the sequence. My extension sight in front of my left eye exaggerates the effect of canting. I did manage to shoot a couple of distances without canting and the left /right closed in which was good. I had to continually look to see that the extension thread was level. I found that a bit distracting as I wanted to look through the aperture to the gold. I wish I could find out why the canting happens then I could correct it; as in, set and forget.
2) I found my bow shoulder was struggling against the mass weight of my bow. My bow is low mass weight with a long rod and no weight; finished off with a side rod with half a weight on the end. Perhaps I need a Genesis!!
3) My release hand sometimes drags to the side, away from my chin on release.