Bill,
It's hard to tell for sure from the video, however it looks like you might be wiggling your fingers and setting your middle finger too 'hard' on the bow, and maybe too 'far around' on the grip as well? (Maybe it is just a small bow grip?) (I would wager you have done a lot of bowling?)if you give me odds
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When I first set the nock with a deep grip on the string, I like to have my bow hand wide open. Even though the draw is only at about 10% at this point, it's a pretty sureproof way to feel the bow is being pulled into the middle of the arm bones and the lifeline in the palm. Before, or as?, I start the full draw, I put a 'snug' grip on the handle with my thumb and forefinger. The lower 3 fingers automatically seem end up lightly touching the grip during the shot.
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I wish the author of Idiot Proof Guide would put out a book for specifically for traditional bows, but I still think his book is 'must read', even if you don't shoot compounds. I learned so much from that book and am finally getting 3D rounds above 100, and got my 1rst round without a zero 2 weeks ago. My burnig goal now is to do rounds with no second arrows.--
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Oh, your brace height seems high enough to not worry, but I was taught to move my watch to the right arm while shooting.