I can recall having the same issue with my 40 hp Nissan on a 15 ft Alumacraft wide bodied jon. I loved how the boat would jump up on plane... but I actually had to drop the motor two more holes to offset the hydrofoil's tendency to load up the back end of the boat. In other words the back end of the boat was plowing a bit causing a loss of top end speed. Hard to believe what difference such a small adjustment made.
"Just Like Iron Sharpens Iron... So it is that One Man Sharpens Another Man." Proverbs 27:17