I skimmed through this, and I second the fan shroud. There was actually a pretty cool write up in CarCraft a while back preaching the importance of a fan shroud. Basically they were saying that without a shroud, the only surface on the radiator that is being efficiently cooled is the area that the fan covers. With a shroud, you are effectively utilizing the fan to cool the entire area that the shroud covers. So you want to get something that covers a large area of the radiator...something like this
http://www.jegs.com/p/JEGS/1014845/10002/-1
But in all honesty, since your fans are hooked up manually anyhow, I would highly suggest looking into getting a ford taurus SHO fan to put in there. That thing is a beast. People use em in 4x4 projects all the time. It mates up to a 3rd gen radiator rather nice with minimal fabrication. I had to cut out a section of plastic or two to get it to fit. Thing pulls over 4000cfm of air on high speed (low speed I think is somewhere in the realm of half that). You can get these for $50 on ebay.
Although I do agree that your fans on there right now should be keeping your car cool to an extent, it may be something to really look at. I think I ran in the low 200's with the 3rd gen dual fan setup, with only one fan working on a stock setup.