When I used Ego T, type A and B, the only problems I had with leaking were really thin pg
juice. Some of the tips I've read on this forum are: When you first puncture the tank take the end back off and carefully remove the tab caused by the puncture. If you've got a trashed atty use it to puncture a new tank. Use a
juice at least 30% vg (slightly thick) and when you put the tank on twist it at least a quarter turn to seat it on the wick stem. The juice getting in your mouth is probably condensation. When you let go of the button keep drawing half a second to clear the vapor. If all else fails get some cartos. The tank system did me pretty good really. I still hook one up once in a while. Some have had good luck and some have had bad. They definitly require some tinkering.