Replace the Protank head with the head from the Evod. You're draw will tighten up. Another handyman fix, place one wrap of teflon tape around the post and poke out however many holes you find works for you. There are 4 airflow holes around the base of the protank. I just got mine this weekend and haven't played with the airflow yet. I have however started taking really light slow inhale vs pulls and i don't really notice other then i have to pay attn and not just puff away. But the tank itself is just fabulous so far.