I wouldn't put soo much emphasis on puff count, there's just to many variables. For one not every puff you take is the same. Is the tank completely empty every time you fill and start puff count? And are you sure you fill precisely the same every time? Those may not account for the whole
juice discrepancies but could account for some. That along with different puffs can make differences from tank to tank. And as a whole, the older the coil, the less puffs you will get. You seem to average 40 to 50 puffs per ml of
juice which seems good . I am using at the moment a coil that's 1 ohm on a kayfun mini 3 (which is not going to eat as much juice as your sub ohm tank) and I average like 35. What juice are you actually
vaping? A thicker sweeter juice will shorten the life of coil faster, I have some juices that I can get many many tanks out of compared to some that will destroy coil after one tank.
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