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Hi Barrie, one thing I did with my HT when I charged at high temps was to activate the fan briefly at intervals to evacuate the moisture that may accumulate in the RC from the drying phase. I do not have any evidence to prove it, just anecdotal information from other roasters here.
I did not believe i was dropping temperature as much as the need to remove moisture in the air of the RC.

Are there any electronics or electrical experts than can shed light on the 'side effects' of running a machine like the HT at a voltage higher than designed?

Just a thought.
Ken in NC