The trick is, if you start getting dry-ish hits, to take the tank off your mod, block all the airflow from the bottom - basically cover the end of the 510 connector, and the single air hole on the side of the 510. Now, take a long draw or two through the mouthpiece - you'll get basically no airflow, but should see some bubbles come through the juice holes on the Killer into the tank. I have only had to do this once per tank, just after refilling.
THIS.
This is brilliant.
Somehow, it balanced everything out. Now my dry pulls/hard drags are actually making bubbles. Wow.
I'm still excited to be getting new tanks... But thank you!!