Ok I have a problem with my 10w and mini. I am a bit odd, may be on my own, but I use a Kangertech Sub tank Mini. I know it won't work but mine does as I use the rba coil built at 2.5 ohms. Problem I have if I tighten the tank the tinyist bit I get a low indication. If I back off a 16th of a turn it works. Another 16th and it's open circuit. Funny it works ok on the red ones but not the blue ones.
Just posting here in case someone else has had similar problems.
Just posting here in case someone else has had similar problems.