The first question is where did you install the bait well? Second question how much weight do you have in the back?
I have a 23’ 1976 CC and moved it forward to just in back of the leaning post seat. Plus I installed a deck for it to sit on same height as the gas tank platform, then I moved as mush weight forward under the center consol plus one motor on the transom then I cut a drain hole approx 3” maybe even more from the top of the tank and drains out the back close to the bottom of the V of the transom. I don’t get water overflow unless a bait fish gets stuck in the drain. I also have a sealed deck hatch kept close unless I am putting in or taking out a bait. With all this the water level is almost up to the deck but it doesn’t overflow.
FellowShip
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My motto: Just for the Grins