Interesting experiment you have going there, I use a slow cooker often enough to think about modding it, however one thing they have in common is the closed air gap surrounding the heated bits, an air gap in its self is a good insulator, packing this area with fiberglass will stop air convection currents?, you could equally leave out the insulation and stick some shiny foil to the inside of the outer bowl, to reflect the heat back inside.
Cheers
Mike
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