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So I got myself an 8mm chunk of steel plate today. I will need to modify the temperature sensor slightly as it reads more accurately off the leads than it does the body of the TMP36, this I knew anyway but tried to semi-fudge it if you will. Will add a copper plate or similar to the ground pin and have that sit on the board instead for a more accurate reading. I can certainly get the board to the desired 120 degrees and the plate maintains that temperature evenly over the board, I am seeing less than 3 degrees of variation from the edges to the centre, understandably it takes some time to cool down.
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