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I like the taste of the Geni mega but it gets hot.
Mine don't using 10.5watts with a Coolfire which I find is ample using 1.5ohm coils.
Around 10W is about the limit with those tanks IMHO, I am usually between 8 and 9 on 1.5 ohms but i recoil the stock dual coil heads with single coils. You might need a heatsink-type spacer between tank and device shez, and turn it down a bit