That is the starting point.
Go up one bolt hole and see if there is any cavitation (ventilation) during various turns, starts, etc.
One characteristic of being too high is a grinding or rumbling sensation not noticed earlier running wide open.
No real noticeable vibrations from going up one hole, try the next one up and see if it performs better or not from the last.
The V's seem to like the bow a little lower than every other boat, don't judge them by others. They perform better almost flat instead of trimmed up.
This is a picture of a 20" transom and a 20" motor close to the best location. The cavitation plate is a little over an inch above the bottom of the boat. So don't be surprised of your adjustments.
