At 5650 engine RPM you have a prop RPM of 2716. On the Moose's boat, he would have to be turning 6219 engine RPM to match your prop RPM of 2716.
His boat will do 38.5 K around the same 5650 RPM that your boat is doing but at only 2467 prop RPM. You are spinning an identical prop roughly 10% faster to achieve the same speed with no wind catching top on your boat. Hmmnnnn..
I'd check the prop first. Just because it looks good doesn't mean it is good. Could have been re-pitched before it came to you? etc.
If the prop checks out, raise the motor a pin hole and retry. My experience with the 23 hulls show you need to be an inch higher than the deadrise point, maybe an inch and a half.
I'm not a huge fan of bolt on brackets but will admit that Kennys set up performs great. If after verifying the prop is "right" and raising the engine doesn't solve your issue, I'd def consider bolting on a 10" set back bracket.
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