Thanks for the update Madshock.
Mad, typically what consistency of juice are you burning? Is it 100VG, 100PG, 50/50?
Just curious if your refill to another juice had a higher VG compound than the prior. Not saying that the higher VG would be completely to blame, but perhaps the mixture overlap from the prior to the latter could be the culprit...? (Just speculating) Also there could have been a reaction from more of a lower acidic juice to another...?
Also, if my memory stands correct, I don't remember you posting the current ohms of this current coil you're using or the current voltage / wattage - battery size. This could possibly create the effect you are experiencing with the gunk.
Ohm may be a bit high with the voltage you are currently at (ie: 3.2 ohms / 3.7v) for example. Again, just speculation on my behalf.
Good luck with the testing. Hope it all works out well. I'd like to eventually try this after it's know to stand the test.
Definitely keep us in the loop...