Thanks for the how to Whistler. I have a protank and got some Kanthal .34 and 2mm and 1mm wick for rebuild. I've seen 2 videos on the protank rebuild and didn't notice any burns on the plug. I wonder if its the voltage applied that caused them, or chain vaping on a high volt setting? The stock heads aren't double wrapped like you show doing and I can't wrap my head around electronic calculations either but if that stopped the burning of the silicone sleeve then I'd say that's a great idea to do it that way! Are you not getting the burn marks now since double wrapping the legs?
Great tutorial and thanks again.