Without reading this whole thread:

1. Check water pump - the divider plate spacing could help
2. Check fan clutch - (I wish I had, that was probably my own biggest contributor to heat issues).
3. Add cooling - Aluminum radiator is pricey but can help
4. Check baffles
5. Check thermostat - leave it in - taking it completely out will not allow the coolant to cool-off while in the radiator.
6. Check timing - bad timing can add heat
7. Add an overflow catch tank if you don't have one. A big helper in radiator life span as well.
8. Make sure you have a fan shroud and that the fan is inside the shroud the correct amount.

My two cents,
Scott