Here's what I did when I had an o23.
First, I shaved about an inch of the top of the wood mount that the motor clamps onto. This still left enough wood for the clamps to hold on. Then, I took the mount off and dropped it down so the top off the mount holes went into the bottom holes on the boat. Drilled new holes for the bottom of the mount. Filled the old holes with marine tex. The old holes didn't show with the motor in front of them. The end result was the motor just did skim the water when the mount was up and the motor tilted and the boat heeled to 15 degrees.