I'm trying to get the maximum hash possible which requires higher TDP while at the same time attempting to keep heat down.
If I have to roll back TDP because of heat then I will. Partly why I'm fishing around for heat figures and what is deemed generally good values to shoot for.
You did mind that your cards will reach their life end way earlier if you run them @100%?

Running cards at their intended spec will not dramatically reduce their lifespan.
Running the cards up near thermal limits will.
Besides, do you really intend on running those cards for 3+ years?