This may get a bit long, so bear with me. This is what helped me after months and months of trying to cure TP using every method and help source known.
Two things I have found that are helping me are Comfort & Confidence. Both physical and mental of each.
First the physical. If you shoot a tab or a thin glove, give consideration to a thicker tab such as a Black Widow, or a thicker glove such as an American Leathers or Black Widow Stick Tight glove. (Note - not pushing BW products, it just works out this way for this purpose). If your finger joints are not comfortable at anchor for longer than two or so seconds, you'll never get mentally comfortable aiming. Try making a switch if for no other reason than to get through this. A lot gets written in reviews about "let's me feel the string". In this case I DON'T CARE about the feel of the string. What I want is to feel myself comfortably at anchor so that I can focus on my aiming, and running the last part of my shot sequence.
Mental - you must be mentally comfortable aiming. A huge part of TP is the "vanishing sight picture". We're afraid that the "good" sight picture we see will vanish, so we let her fly. Often with no thought to our shot routine.....always a bad shot, right?
Start with your thicker glove/tab and only one arrow at the blank bale or bag target. If you don't have a spot to aim at, make one....aiming is what this is all about. Forget your form for a bit. Your goal is to get comfortable aiming (I promise you that your good form will return). Don't worry if your arrow consistently hits somewhere else....just focus on the sight picture that you want to see at anchor (you can retune later if necessary).
At at distance of 4 yards, draw, anchor solidly, and aim at the dot. How long were you able to hold before you let it fly? Good! Now, keep at it at 4' until you're in complete control of your release or the continued pulling through to conclusion of your shot while aiming in the manner you want to aim. When I started this, I had to stay at the bale for a full two days (I spent 21 days last year after one of Rod's clinics working on total form). You may have to stay longer, but however long it takes, do it! If you're not comfortable aiming, you will have a very hard time with your hunting success.
If you're familiar with bridge drills (search function), then that's where this is headed. No matter what, and you have to be completely honest with yourself here, if you shoot a less than comfortable, controlled, and perfect shot....then you need to go back to 4' and start again. I start over several times each day.
This process will not take as long as you think (remember....one arrow only), but getting comfortable aiming.....first by getting finger comfort on the string, and then at anchor, and then in your mind, will put you at ease at anchor, and on the road to riddance of TP.
Hope this can be of help to you. Rob