Hey, i have very similar problem with my 75 sanger super jet. it porpoises bad around 3-4k rpm. i have a wedge and a droop with a small ride plate. i was trying to take the wedge out because i got alot of feedback that, that was probably alot of my problem. but when i get on it full tilt it smooths out just fine. i just couldnt get the droop to seperate from the wedge. so im stuck now. havent got any info on glass water yet, just this boat last week.