Honestly I'm drawing a blank on why your temps are fluxing so much. Of course that's the indicated temps on the Accurite (which to be honest, I don't use anymore).
When you get your temp gun, shoot readings in each tub at several different locations to give you a surface map of the temps. Also shoot readings of the flexwatt to see if its reading consistantly across the length of the tape. Any discrepancies may lead you to the problem.
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