Earl, I did the fan trick on mine so it's always on high. I believe mine is plugged up like you mention (factory rad) is there a good product that will clean the internals to where the rad is efficient again. I see royal purple has a something called Royal flush, or are these products just a waste of money. My stock rad is in good shape and would like to keep it.Jump out the resistor so low is now high. There's no performance gain from spinning your fan slower.
If you have an original radiator and run hot in the interstate it's because the bottom 3/4's of the flues are clogged up.