FE Cooling Dilemma

[flaflier]

Ok,
I am running Evans NPG+ with all of the purported benefits it provides, but here is the situation:

I live in Central Florida, where it rarely gets below 40 degrees, but yesterday it was 96 with a temperature index of around 105.. with 80-90 percent humidity...HOT

Car runs around 200 - 220 with NPG+, brass/copper radiator, puller fan, etc.

I also am not sure what thermostat I have, but I think its a 180 or 190 by the way the temp gauge reacts. I also have a 13lb cap, which is wrong as I have read.

My 2 options are:
1) replace the cap (4lb if I can find one), change the thermostat (insure it's 180) and try it again with the NPG+

2) Get rid of the NPG+, put in distilled water and water wetter, a new thermostat (180) and keep the 13 lb cap.... with this option, I probably wouldn't put in any antifreeze, again, it doesn't get cold down here, and when it does, my garage is warm....

Comments and suggestions appreciated.