Hi Reel Toy
The center of my overflow line is approx 4 to 5 inches from the top of the tank.
I never have a overflow problem sitting still but when running 30 MPH with the pump on I need to close the hatch lid or more water is coming in than going out.
The only time I ever have a overflow is if a bait fish gets sucked against the overflow line so I did this.
One question how many gallon per hr pump are you using to fill the Tank??
FellowShip
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Just for the Grins
Official 23’ SF Antique Classic SeaCraft Owner