Hi, I had the same issue in my Miramar and finally found a fix. It was horrible, when it rained the water ran on my dash and even onto the floor. I tried sealing around the window to no avail. I also blew out the weep holes with a compressor to make sure that there were not clogged, still no luck.
Your picture of the water deflectors was very similar to mine... then I found the problems.
There were two main problems.
The first was the rubber shrunk and retracted leaving a open area for the rain to run in. Due to the small size of the weep holes they just could not keep up with the volume of water.
Fix: I simply pulled up the seal and reseated it making sure the bottom edge was tight against the frame. I applied black caulk to the end to keep it from retracting again.
The second issue was related to the application of the exterior window trim. It was raised above the rubber seal holding the water which exacerbated the issue.
Fix: used a small file and cut drain slots along the bottom edge.
Retracted Rubber Seal:
Closeup of Drainage Notch:
Since i made these changes my coach is water free even in the hardest rains.
Hope this helps!