seat moves

You might try loosening the mounting bolts and purposely pushing the seat rails apart to make them bind very slightly. That might tighten things up enough to stop the unwanted movement or at least make it less noticeable. Don't make it so tight your power seat motors can move the seat.

-- Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia? It is to prevent the establishment of a standing army, the bane of liberty. . . Whenever Government means to invade the rights and liberties of the people, they always attempt to destroy the militia, in order to raise a standing army upon its ruins." -- Debate, U.S. House of Representatives, August 17, 1789