You didn't lose me, just a tad busy.
I did actually buy a new battery, LG HE2. Tried it out again and while the battery performed great with no problems I have the odd burnt taste lingering on the Atlantis.
I changed the coil and primed it, however I think the rubber ring may have absorbed some of the smoke as such. So I'm going to give the tank a proper clean tomorrow.
SMK said there's nothing wrong with using tanks with the Flagship. So it must purely be a battery issue as far as their guess goes.
This has been a huge eye opener, I alerted the shop of what happened.