Atmospheric River - in my door jamb

[Jonny]

Your door jamb flood and your wet rear carpet may be related. Once I was storing a 5 gallon jug of water just inside the sliding door. This leaked and manifested itself as a pool at the passenger door right at the same place as yours. It's a low point and the water from the jug in the back went there. I'd concentrate on solving the rear leak and see if this fixes everything. You may have to start taking stuff apart if you can't find the point of ingress, so you can more easily see evidence of water behind things. Seats, side panels, carpet, fun stuff.
While you're at it, the drains in the front doors (right at the front of the bottom sill behind the rubber) are prone to plugging from debris ingress as water and crap runs down the window into the door. A blocked drain holds water inside the door and rots it. Check these too.

door_drain.jpg