I don't have that tank. But you mentioned you have/had the flu. That could be the source of your burning/blister lip problem.
Also, people report all kinds of medical annoyances when quitting cigarettes.
Could even be your juice. Anything.
Hope others who have that tank can help, but I doubt it has anything to do with the tank.
It more then likely is this terrible cold I still have, Hell to be honest I cant really taste anything right now. But yeah my lips to feel kind of burnt red and sore, I don't think it is the e liquid because I have been vaping it for well over a week and it was find when I was using the Cerberus Tank too. More then likely it is because of my allergies and this head cold from hell now. At least my fever is gone think god.