One thing I did to stop that is wrap the coil once between the brass nuts on the post. And when you do that, make sure you put just the right pressure on the wire. Once that's done, wet burn the coil in short bursts to start with and slowly increasing the time for a while until the wire gets oxidized and then the hot spot won't happen anymore. Keep dripping the juice on the coil while you are wet burning.
Could you also pre-oxidize the piece of coil you intend to wrap?
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