I have a newish honda 50/35 jet on a 16ft crestliner. the motor seems to loose power or be over revving. the impeller is good and i have a new sleeve put in. its shimmed down correctly but still isn't pushing. im having a hard time even getting on step if i can get there at all. one thing im worried about is i ran it last week without realizing that there were rocks in my tube that spits water out the back, showing that the water pump is working. i cleared it out so its spitting water out and still am under powered. stumped on what i should do next. don't know whats going on with this thing. any suggestions.