OHMS to run on a nemesis clone mod

I have a nemesis clone mod, not sure of the exact model but its a pinky fired mod, (where you push in with your pinky to complete the circuit to get a hit) I am currently using the Aerotank mega for my tank and the battery inside is a TrustFire IMR 18650 2000mAh 3.7v, my question is what kind of coils do i need for this? I am currently using KangerTech dual coils at 1.5ohms but i want a bigger hit and im pretty sure this mod is burning them out pretty fast. thank you for any answers ahead of time.

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