1Evil, the info that you had a large radiator should have been included in your post about not needing a huge fan, IMHO. Once you begin moving again, the large radiator is able to cool the motor back down quickly.
I dont know how you do it - I also live in the desert and need a lot of fan for in-town driving (when the air coming off the asphalt is 150*+ while it is 115*F outside). If no air is going across the coil (via a fan), all the radiator in the world cant help a stationary car with no grill and/or no ambient wind.
I am glad that works for you, but nothing sucks more than installing a fan which is insufficient. Ergo, recommending an overkill fan cant hurt.