Hey Deermeat, I think I may have the same issue, my water is coming in from a small oval hole in the left kickpanel about 4 inches up off the floor. When you put water on the left side there it takes a while but then it must reach that level and start pouring out, Ill see if I can attach a picture...I took the wiper cover off and looked pretty damn good but cant for the life of me figure out how that water can get into that passage, unless its coming in from where you are saying. I can see inside of the A pillar, maybe I can use a step bit and drill a hole there so I can see in there....
https://cimg6.ibsrv.net/gimg/www.hum...03df5a3c96.jpg

https://cimg7.ibsrv.net/gimg/www.hum...264d455d14.jpg

See the water coming from the oval hole? I have a hose spraying water on the left front windshield area