using a Kanger Protank. when does one know when the coil needs replacing?
Try rebuilding them yourself if you haven't already. I used to get a much better taste, plus more clouds. That is until I switched to RDA's and RTA's
No real point in rebuilding the Kangers when you can buy a new coil for like $2.....plus its a pain in the .... (speaking from experience with the Kanger Protank mini)
---------Replace when you get a burnt taste. I buy authentic coils from ebay which are just over $1 each, but i don't use the wicks that come with them anymore. They are so inconsistent lasting anywhere between 1 day to 1 week. I simply just use organic cotton as the wick while using the existing coil. You get more flavor, taste is much cleaner and the wick doesn't burn for days. I use this method with my mini protank 2 and the cost is dirt cheap.