This was my first time at Broken Bow this weekend...i ran my boat one time coming off the start when i gassed the boat it wouldnt go...till i let off the gas some and got some speed up....guessing the pump???
Sounds like it is time to rebulid the pump. If the motor was rockin and the boat was not moving woud be a safe bet that the pump is slipping or the impeller is beat up and needs some detail work.
Look to see if you have a rock or a stick in your pump, if not you need to check the wear ring for damage. Thats about all that will stop them from gettin gone.
Keith