MediocreT, I'm sitting here with my A2-T and A2-TM, both wicking fine. Here are my tips, for what they're worth: I make sure there is a very short length of the wick sticking out the top of the SS roll, that actually goes into the
tank cartridge hole when the top section of the Bulli that holds the
tank is screwed on. I also have a longer length of the wick sticking out the bottom of the SS roll, so the wick alone, and not the SS, touch the wick that is part of the coil. And finally, and probably most important, every now and then the wicking needs to be sort of primed - and that is accomplished by holding your thumb or a finger over the hole in the spike section of the atomizer, and taking several strong puffs
without the power button or switch being engaged. Actually, I puff with the hole covered, and then without, in sequence, two or three times each. After that, wicking is back to perfect. That's a tip I first got by watching a video review of the Bulli tanks by Rawveg on UK Vapers.