My issue when I had this was the door seal (passenger) just at the point where the door stops/window starts, the rubber tubing had become flattened over time nothing more. Its the point where one side of the seal seems to fit into the other. Leaked at exactly the same point on various inclines, carpet wet etc. So I spent a few hours with a hose one day and waited for the water to start dripping which it did, I thought it was the seal filling with water and not draining as it should. That's when I found the entry point and the fix....
Cut a smaller diameter tube from an old brake bleed kit, just so happened to fit nice and snug, half going up the door frame and the other down towards the hinge (used washing liquid to ease the task), this pushed the seals back out which fixes one issue of water running almost around the door frame at the bottom, the tube left the channel open so anything inside the seal still drains. The tubing insert is harder than the seal so hopefully it wont compact/crush as the original....anyway, it's water tight.
Fixed the problem for me, hope it helps!