The last bit "I don't have access to coaching" says it all for me.
You are very much wanting to go forwards and have also found air has helped everything else you shoot, good.
The way I think to go for you is to pick up a scatt usb second hand, the reason I say that one is there are a few about and they work well. As others will tell you too it can blind you with science with what it can do but you can keep it simple as do the top coaches in the World. There is no hiding when you shoot at a scatt it shows up everything you do wrong, too much to put here.
PM me