I have a 08' 250xs warranty expired Nov. 2010 Motors been great up until the past couple of months. Within the past two months a Mercury machanic has changed the prop shaft seal twice, shift shaft seal twice and the water pump twice all at different intervals. They charged me once for each change thinking they might have missed something each time. They finally took it to the lake and ran it and said I had the motor set to high (1"1/4 above pad) and it was causing to much stress on the drive shaft, so they lowered the motor two clicks. I bought the motor new and it was set up by paul nickouls. Its on a 21xrd bullet with a 26 pitch TXP four blade prop. Motor has 132 hours on it and the problems started around 125 hours or so. I have'nt run it since it was last fixed but I know it's got to affect the preformance of the boat. Any help on what might be going on would be greatly appreciated.