Guy's, both those sore spots indicate some "scrubbing" of the fingers at release...Bob's may come from the index finger opening a tad slower than the other..with Hera's 3rd finger getting burning by the string, because its didn;t clear quick enough. Both are primarly caused by un-needed tension in the string hand, or a slight collapse at release.
Try using ONLY enough tension to keep the hook formed and while increasing back tension, relax ONLY the back of the hand.