Spitback occurs when over wicking or the base tray has ejuice sitting in there...i posted some pics of the perfect wick for the tank...also close off the air ring a bit to reduce gurgling!
I agree...it's best to use the big builds on this tank because plain wire seemz to mute flavour and flooding occurs..brilliant atty imo.i have one as well..remember not to over wick...less is more!
This is definitely a vacuum issue in the tanks have exactly the same problem on my ammit 25,close the flow slots and air slots when filling and turn it upside down before opening slots again, this will reduce spitting too.