Mini Vivi Nova uses liquid fast

I am using a mini vivi nova with my Ego-T 1100 passthrough and it goes through liquid so fast. Within about an hour and a half the liquid is completely burned out. I'm running the 1.8 ohm atomizer head, I know that's not the best one, I was told that 2.4(5) is the best to use. Are the Ohms being low and the Ego-T(3.5v) the reason for it burning liquid or did I get bad or possibly fake vivi nova's??