I'm trying to help out a neighbor with his Polaris 3900 and we have been working on this thing for hours and can't get to drive right! I have adjusted Polaris's before and there is a bit of trial and error but this thing come on! When set in the water it starts running straight but the front wheel seems to always want to be about 1" off the floor, adjust the rear jet seems to do nothing? Then after going straight for 10' or so it just starts to lean over at a 45* angle and do tight donuts ? Then of course the hose is all twisted up and puts tension on the cleaner and it can't correct itself. If I correct it the whole process starts over again? With my 280 you can adjust the float and rear jet and fix these problems but this has no float and I've played with the rear jet and I can't get anywhere? He taken it to the pool store and they tell him it's fine theres nothing wrong with it. It's brand new. The RPM test reveled 35 RPMs so it's got tons power, and it moves pretty fast! Anybody have any experience? Also I checked the drive jet for debris and there was none, obviously because it runs around like crazy!