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Be sure you are bleeding the coolant hoses when you install water/ coolant. If you don't air pockets can (and likely will) get trapped in the heads and cause hot spots like which will cause the problems you have. There is a bleeder screw for the top radiator hose on your car (or should be)
I owned a '95 T/A out here in Los Angeles and we had every bit as much heat in "the valley" as you would in Fla. My car ran well until I got into hot rodding it. then I had to upgrade the radiator. i bought the "Be Cool" radiator. Not cheap but that did the trick. It was almost 2x as thick as the stock radiator and made of aluminum. it had a much better cooling surface area.
It's a good suggestion to use the lower thermostat and reprogram your cooling fans. you can do this with the hypertech power programmer and the SLP 160 degree thermostat. It's also a good suggestion to check the basics- make sure your fans are working and make sure your radiator isn't clogged.
You should be using distilled water since you are running aluminum parts. regular tap water has contaminants that will help corrode the aluminum.
However, the factory running hot settings shouldn't be causing the head gasket to fail. engieneers designed the car to run hot for emmissions reasons. For us hot rodders, this isn't helpful. I think you should be sure evertyting else is up to par first and that you have all the air pocket out of the cooling system.
I hope this is helpful!
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