How much do you weigh and how long is the senate. I'm 165 lbs on a 67 senate. I learned the course on that ski 15 off 28 mph no problems with sinking. If your sinking on turns could be your pulling to long past the second wake which creates slack when you go to turn. Ski goes flat instead of quick turn and you sink. You should be pulling soon as you round the ball and you should quit pulling and start changing edge at second wake.