The different plugs (levels) all plugged into a extension cord is going to be problematic and potentially dangerous. Is the extension cord a surge protector type? I would consider a Herpstat 4 for this situation or a top quality surge protector may help. Belkin Electronics makes the best surge protectors and extension cords. Just my thoughts and i hope this helps you.The varying degrees along the heat tape i think is normal.
Stay in peace and not pieces.
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