What does "cycle the element too much?" mean? Are you worried about the life of the element? If so don't worry about it. It will be fine.
Once you get the PID setup it will hold the temp at whatever you need to keep the meth flowing with out it getting too hot and spoiling your purity.
Look at what fabricator said on the first page of this thread
Simple schematic for a pump and heater control with a high limit
Sensor for the biodiesel/glycerin layer
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