I had the exact same problem and my “Chine walk” was more like Plinko on the Price is Right at 67 mph if you know what I mean. The heavier I loaded he boat, the faster I could drive it though.
I raised my motor up around 1/2″ until the motor slightly blows out on the hole shot. I cannot believe how much more stable the boat is at 65-70 mph. I am still getting good water pressure too. Hole shot suffered a little bit but it is still pretty good. Be careful of that if you raise yours.
2021 P2 200 Merc Pro XS 4S with 24P Fury prop 3 blade.
My dealer had the boat to 76-77 MPH (empty boat and current may have been involved) after raising motor. However, I have not had enough time to go to big water where I can stretch her out. I still get to 70 mph easily on my short runs fully loaded…..I mean FULLY loaded (every compartment stuffed and 30-43 gallons of gas).
I hope some of this helps you out.