Above 80 watts I was getting an immediate hot spot of the case of my Gen 3, so hot that it was burning my finger. The heat was localized to the corner where the hinge and the main body intersect. Thought it could be an issue with the end of the board where the USB is attached. Or an issue with the contacts in the hinge. Looking inside the battery cover I could see some slight discoloring of the the two main contacts that connect the door to the main body where the current flows from the battery to the electronics (pictured below). I lightly sanded the contacts, and the main battery contacts, then cleaned them all with Brasso. I also cleaned the 510 connector, but just with kitchen roll as I dislike putting any cleaning agents in that part of the mod. Hot spot gone, and also an increase in mod to atomizer wattage output that I had noticed was depreciated. So the corrosion/oxidation was inhibiting the flow of electricity and also possibly causing some micro-arcing. The point of this post is not just specific to this particular mod. Regulated devices need basic maintenance and up-keep the same as unregulated mods. That is all, thank you please.