Getting juice in my mouth.

[WoodChucker]

I have 3 Kangertech sub ohms and 2 Aspire sub ohm tanks and all 5 of these I'm getting a juice taste in my mouth. It's not real bad but it's bad enough to be annoying. I also have 4 Kangertech Subbox mini's and have no problems with a taste of juice with these. I replaced all the tips thinking that would cause this but it didn't help at all. If I remove the tips and blow them out into a napkin it looks dark brown almost black like nicotine from an analog cig. Anyone else have this problem and have you been able to fix it? Thanks!

 

[SpaceApe]

How old are the coil heads?

 

[Robert Cromwell]

Yep the dark stuff makes me wonder about the coils as well.

 

[EBates]

Juice in the mouth and blowing juice out of the air ports are signs of flooding. Possibly caused by bad coil head, tank air flow setting too low (tight draw), taking excessively hard draws.
This happening on 5 different tanks makes me think that the lowest common denominator is You, your draw technique. I would find it difficult to believe that 5 tanks from 2 different mfgs would have the same defect.
Just sayin'