A friend brought up a point I haven't considered:

Why not just leave the electric fan on? I've got it programmed to not run at 30% TPS or greater. The temps would drop in the corners at BBORR - well that partially might be because the fan was coming on.

Obviously the fan solution isn't fixing the root of the problem, which is a lack of a pressure differential great enough to cause significant airflow.

Potential problems causing the lack of a pressure differential:
- 1" gap between hood and top radiator crossmember
- hood is not sealed to body at all
- hoodscoop
- holes in front radiator crossmember (behind the parking lights)
- AC condenser in front of the radiator (apparently needs to be 3/4"-1" away from radiator)
- Oil cooler in front of AC condenser (only behind the bumper - ran 240*F oil temps, btw)

Things I've done:
-lowered the lower radiator crossmember (and extended it to the sides with an airdam)
-Sealed the front airdam / splitter to the bumper
-sandwiched foam between radiator and radiator crossmember
-sealed a couple small holes in the radiator crossmember

BTW - I checked my temps from a recent TWS track day. Never got over 220*F. I also ran a session without the fan in the car - temps were nearly identical.