You won't have any problems with airflow on the AGR, it gets its airflow from between the bottom locking block and the bottom end cap, so it won't get cut off by sealing against the top of your device.
Anyway, I'm not sure about any other locking tanks beside the AGR and the UDCT. I know I saw a tank awhile back that locked via some sort of cam style locking. It had a lever which pressed down against the carto, basically locking it into place. This was awhile ago that I saw this, and I have no idea if this was a commercial unit or some one-off thing.
The AGR's issue is with it's loose seal around the carto. Evidently some AGRs are fine (and there is supposed to be a V2 which fixed this issue from what I've heard) but many people have issues with their AGR flooding like crazy, because the tank doesn't seal well against the carto, allowing air into the tank, causing the tank to feed too much juice.
I got mine working 100% flood free. I just used a thin file to file down a slot into the carto. I stopped right before I got all the way through to the filler material, then I used a push-pin to make a very very tiny hole. The hole being so small restricts juice to the point where it no longer floods, but still feeds perfectly.
I could have simply used a carto punch, but the method I used allowed me to be very precise and not make the hole too large. Punching a hole anywhere near "normal" size resulted in flooding cartos 100% of the time I tried to set it up like that.