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Started writing this before second vid, which is definitely better...
Swinging the hammer incorrectly with no regard for nose/head angle. Your front foot is spinning out open, trying to use your weight instead of the hammer's weight. When you transition from backswing forward the nose/head of the hammer goes up instead of down. Too much lag and too much rotation. Your rear arm just keeps going around you, there is no swim/push back to release the front arm.
Your hammer head is vertical facing the ceiling at the finish of the pump/top of the swing (and your followthru in bigger swings) about 90 degrees off where I have it. Should be horizontal and facing right tee pad side, and turned nose or face down after swinging through the nail/door frame into followthru. The head of the hammer needs to rotate back and forth with your whole arm, the hammer should hit the nail flush horizontal just over the front foot, not at the top of the swing, but at the bottom of the swing arc. Drop your front shoulder and let the arm hang completely loose, and keep wrist locked from flexion/extension - you don't use that wrist motion to hammer, only maybe some ulnar deviation to pound it, but wrist is stiff/locked from flex/extend with hammer - feels same with disc. Swing the arm/hammer from the shoulder/s - Reciprocating Dingle Arm.