RE: Shooting form
I anchor the same way you do. My draw is most likely a bit long, but I shoot fine that way. I bring one of the vanes into the spot between my mouth and chin and use that for one of my anchor points. I shortened my draw to see what would happen and hated it. I could not shoot worth a damn and it just felt wrong. As long as your draw isn't so long that you have to lock your elbow I think you will be ok. Try a bow with a shorter draw to see how you like though. Everyone is different.
As far as your grip goes, I had a guy that target shoots show me how to grip that way. The philosophy was the less you touch the bow, the less you can torque it. I tried it for a while, didn't work for me. Again, the way you grip a bow is a very idividual thing and will vary from bow to bow. You have to play with it and see what works best.
A bow sling, do you need one or not? I don't use one and I shoot fine. If you have a bow that jumps out of your hand when you shoot it, you need one. I have put so much crap on my bow that it does not move when I shoot it. It just sits there in my hand after the shot. I have shot a few mathews that were the same way bone stock. I shot a Ultra 2 that jumped right out of my hand and hit the floor though. That was embarissing, but at least I showed good follow thru! I would recomend a sling if you are going to hunt from a stand, if take a shot at a close deer the bow may fall right off your hand on to the ground.
You might try shortening your release a little and see how you like it, it worked for me.
None of what I have said is expert advice. Just throwing my two cents in and letting you know what works for me. It's hard to critique form without actually seeing you shoot the bow.
Good luck, Paul