red -
You realize that you're basically asking "how do I shoot", right?
You have little if any control of the release. If you try to control it, you'll ultimately screw it up.
Based on your post:
1. Anchor variability isn't an option. If you can't get it in the same place every time, nothing else is going to matter. Kinda like shooting a rifle with a loose rear sight.
2. Follow-through is a function of alignment and back tension (pulling through the shot). If your hand comes straight back sometimes, and not others, it means you are collapsing on the "others".
Without seeing you in person, the following are generic suggestions:
1. Set up a shot sequence. Focus on the things you typically have trouble with.
2. Pick an anchor and don't change it. If it's even slightly off, STOP and start over.
3. See if you can do it "right" under controlled conditions. Unfortunately, that means blank bale shooting, specifically thinking about the follow-through. When that feels right, transfer over to a safe target. Safe meaning 5 yards or so and see if you can still do it.
4. As it starts to feel easy, move back to more realistic distances.
That assumes that you know how to grip the string, etc.
Yes, there are devices or more specific drills that might help, but you have to start somewhere and I would do the above before trying more synthetic means.
Unless you're a professional, there are always going to be "ouch" shots, and some will be out of your control. The trick is to stack the deck in your favor and abort the ones that you know ain't right.
Viper1 out.