I have an Champion 210 BASS BOAT that does the same thing. I think the issue is weight distribution. Try having one of your heavier friend's sit or lie up front near the bow. Have your trim almost all the way down before it actually goes all the way in, and hit it with WOT. On my boat the bow eventually comes down and you can hear the motor go up in revs before taking off like a rocket. It will do about 65+mph once it is on its pad right. Once my boat is on plane, it has a tendency to porpoise so I have to continue to trim it down slightly. You will know when your trim is right as it will be fast and traveling on its pad. Both hydraulic Jack plates and/or Trim tabs are the best solution but a hydrofoil for your motor is cheaper although getting them to stay on it a different issue. Hope that helps.
