esige everest tank

I've burned through 4 coils in a combined 20 hits. I put the jac vapour b series at 25 watts, use a .5 coil and the coil is burned in a very short time. I have primed the coil. Put it in loose, put it in tight. Let the coil sit for 30 mins. Ive also let the coil sit over night after priming it...