jmuva44,
What do you use to clean your windows? The old wives tale of vinegar and water sure doesn't work. Makes the window sticky so it sticks to the rubber. I only know this because my wife used it last time to clean my windows. My motor also runs slow with weight. I don't think the motor is powerful enough to move 200 lbs + the seat weight. If it is really slow, then I agree with the above...the motor is going. As far as loose, check your rails and make sure they are torqued down.
:0