I've had similar issues with mine and understand what you're trying to accomplish.
However, I have yet to see the fan (turning on) have much of an impact.
I'll be curious to see whether the fan can reduce the temperatures by 20° from 150, like it's supposed to at 180.
I hope the fan will be more effective if it comes on before things get so hot. I’ll report back with the results.
IIRC to stick with Derale products you need probe 16753 and the adjustable controller 16759? to be able to dial in a more specific on temp. The delta between on/off will still be 20*. You have to experiment to make the on setting coincide with the pan temps you’re seeing as it is a simple adjustment screw with no increments.
The thermo switch for this system uses a 6-32 threaded stud in a coupler fitting. I ordered a lower temp switch to see if things will improve.
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