Of all the great suggestions you have received, one is missing. The water pump. Are you getting the proper amount of flow?

Also drilling a hole in the base of a 165 degree thermostat will not hurt, but will not cure an overheating problem.

When you add coolant it should be a 50/50 mix of water and antifreeze.

Good luck

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Could this be a contributing factor in running hot? Why the need to run two fans?

If the thermo is pushing air through the radiator would the air be able to get through the fan spinning on the other side? In most cases when running a thermo, the factory fan is removed in order to provide a number of benefits - increased hp, cooling only when needed, quieter running.

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I can agree to that, ....ummm,... to disagree that is, errr,.. without meaning to be disagreeable you understand. So wer'e all in agreement? Well, I think i'l just go shut my mouth now.