I would also check the wiper motor is receiving full 12+ volts when the engine is running, low voltage & the additional drag of posh wiper blades could induce judder
Smart suggestion Jon. TY. Dave? This should be added to your list. Got a multimeter handy?
Additionally, I have been told you should check the wiper motor. They're should (hopefully) be a supplier sticker on it. If not.....
L.
P.S. Still waiting for the Factory to respond.
