Here's an addendum to the rain coming in. Today it had been raining really hard. When I opened the FW (all the way), it wasn't raining but there was a ton of water beaded on top of the door. When it opened, a solid stream came in, hitting the left rear seat. I've opened them while it was raining more lightly with no problem and several other times with smaller amount of beaded water with no problem. So there seems to be a specific water "load" that the door channels can't quite handle, mostly after the car has been sitting. I could see the need for some sort of baffle to combat this.