Hesistation might be cured by lower toss, or MORE backscratch positioning. Longer takeback, more takeback.
Need conti grip with maybe eBACKh flavor to get the arc of the swing balanced. Right now, you have more swing AFTER you've hit the ball. You need to hit earlier, and use more prep and before swing, to contact the ball at the top, 12" inside the baseline, and then relax and followthru.
To hit the ball hard, you need more before time in the arc of your swing, and less after time.
At least you DO try to swing hard and fast, a very good thing to us.