FWIW, that problem was just bugging me seriously. I found that trimbright has 7/16" rain gutter for cars w/o built-in gutters, it's in balck, and fits perfectly along the rubber top edge above the window. I tried it for 1.59 per foot, 3M tape holds it on and I found it does a credible job, although I haven't fully tested it in a heavy rain. But for the lighter rain we did have it worked. I ran it from the bottom of the pillar up along the window and stopped it just aft of the driver's window. It sticks out only a bit so it's not noticeable. It may have a small noise from the air going past it, but that's not noticeable enough for me to worry about when it provides that benefit to me. Putting it from the bottom of the pillar up seemed to be the ticket because alot of water gets trapped at the base because of the space there when the wipers are on. Then it starts flowing up to the corner of the window where it starts leaking. This seemed to have allowed the wind to carry it down the gutter before it could build up sufficiently to come in.

I tried at first to mold the entire strip from pillar to the rear window but the curve is too much, so this weekend I'm going to add a small section just for balance so it'll be a two piece install, but being black you won't see it.

Another benefit I noticed is that it seems to break the turbulence coming in the open window at speed, and now I can open my window alot farther without that buffeting in the hatch area.

Search trimbrite rain gutter on the web, and you'll find it. I ordered it and it was delivered within the week. I bought 25 feet of it, as you need almost 12 feet on each side for a total cover. But it does seem to work