Update:
I ordered the thermostat and it will be in tommorow. The shop pressure tested the coolant system and they said everything was tight. Both porsche and this indy shop agree that air could have gotten in the system, and that the thermostat is the first thing to look at. For my own peace of mind, I am replacing the tank cap and the seals while it is being ripped apart.
I was able to get the coolant to leak while I had the carpet pulled off the trunk and it seemed the tank was sealed because none entered the trunk.
Mere trivia: for those who have never bought coolant from porsche, it costs 55 dollars a gallon
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