Ok, guys.... I think I fixed it for good, and it turned out to be REALLY simple. I've now talked to enough folks to have determined that this is a legitimate issue with Protank. Their system for airflow is flawed, when used with devices that have a slightly longer 510 post, like my kmax compared to my twist batteries. That extra length allows the air holes to be completely obstructed within the threads. So when you unthread the pt enough to get airflow and still fire, it wobbles. #obnoxious!!
So here's what now works beautifully for me:
- find the thread location with the airflow you want
- then unthread the beauty ring on the kmax (or zmax) upward until it stabilizes against the base of the pt.
- now vape like a boss....wobble free!
The resulting gap between the bottom of the beauty ring and the top of the device is virtually indiscernable; equal to no more than the width of a single thread or so. Essentially, the beauty ring acts as the airflow regulator, but is very easy to adjust from tank to tank, and remains firmly threaded against the base of said tank.
I am now pleased with both pieces simultaneously!
VICTORY!!!