Running no Thermostat is silly, the Thermostat keeps the Engine at its desired operating temperature. Its basic!! If you have overheating issues its not because of the Thermostat (unless its faulty, but then replace it with the correct one) Instead invest in new Radiator, propper Fans incl propper wiring etc. All trapped Air can in my experience only escape the Engine/Heads if you raise the front of the Car up.
Having a 20psi Cap on also ensures that the system is propperly pressurised and raises the potential boiling point as well. I use 100% coolant with no water mixed and NEVER have any trouble under any driving conditions/weather with my 393"
Btw I use one of Marlins Thermostats
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