Tank systems are somewhat problematic. If you are not successful using that system.......You CAN use your ego battery with clearomizers instead, if the tanks keep leaking.
You can put just about any 510 or ego threaded clearomizer on an Ego T battery, you do not have to use the "system" as it came.
Anything like a kanger T3S, protank II v2 (mini size fits best on ego T), etc. I would get 1.8ohms or 2.2 ohm coils for them.
Meanwhile I will let others help you with tank system, I have not used the ego T in that way, just wanted you to know you have options.