I tried the foam pipe insulation fix and it did help a little by blocking the front grille slots, but coming home two nights ago my coolant temp never got above 180F according to my my "extra" temp sender. The dash of course said 190F but it wasn't... I just installed a flexible cutting board to cover half of my radiator to see what kind of numbers I get today. I popped the grille off, cut the mat in half, and installed it in two pieces as the core support members were in the way to use a full piece. I also noticed there was a lip at the bottom front of the condenser, so I set the bottom edge of the cutting board in there and "secured" the top edge in by using more of the foam insulation for spacers. The foam doesn't crack at -5F, so for right now, i'll see how it goes.
EDIT: The flexible cutting board really helped temp wise. I got 191F the other day after approx 30 minutes of driving. It stayed put, and wasn't affected by the rain.