I'd dig into the switches and check the driver's leads on another switch, if it were happening to my rig. Idk what that would entail to get access, but might be worth a shot. Seems odd that only one window is affected.
I'm on the stock grabbers. I lived in the Santa Cruz mountains for a good while with mine. I found 32 to be a good sweet spot on those curvy roads. 39 produced a bit of oversteer and was rather rough on the old asphalt. 32 got the rig to hug the corners at speed really well. Braking was...