Get one of these...IBTanked - Get Tanked With Us! Once they get a grip there is no way its coming loose. Very tough too.
I'll second IBTanked. I just got 3 of their tanks and I couldn't be happier. Was a little worried about spending so much without trying one first, but they were highly recommended here, so I pulled the trigger. Great taste. Better then anything else I have. I also have a pretty wild commute involving a train, a ferry, and what must be the busiest subway line in NYC. No leaks! I couldn't believe it. I've got some Smok 2.0 ohm prepunched cartos in them. Can't guarantee they won't pop off with high vibrations, but they've survived in my pockets while being sandwiched into a subway car between several people all jostling around. Takes a bit longer to prime the carto and fill the tank, but once you do they seem to be good for quite a while.
Definitely loose the iClear 16. I liked the flavor, but I'm no longer going to use them. I've lost too much liquid to leaks with them, and since they're dual coil they seem to go through more juice then the carto tanks. Even though the carto tanks don't eat through juice like they do, they give me better taste then any other clearo.
You may do better with any 510 connection then an ego connection with the vibration I think. You could try the iClear 30. It gives good taste (carto tank is still better), and it doesn't seem to leak, but that clearo is my ultimate juice guzzler. I may phase that one out too.
My husband only uses Mini Protanks for ease of maintenance, and no gurgling but I dislike the taste. After getting used to the taste of te 16, you may find that the Mini Protanks mute taste as well. Those are also ego connected, so the vibration issue may still exist.