i have an issue with my 07 waverunner fx ho, on heavy acceloration craft sounds like its bogging and does not have good acceloration, after getting up to about 25-30 mph sounds normal and picks speed right up to max speed. craft does not due this out of the water, only when in the water. i have it at a general service shop already, and they checked the pumps and said they were both fine. the shop has had the craft for about 2 weeks now and they cant seem to find the problem. should have brought it to dealer. i have also already replaced the plugs. any suggestions or similar issues would be greatly appreciated?