Ok could you suggest one for an advanced user?
Not really, I've never seen any reason to advance past the IGO-L. Unless your looking at trying dual coils, but I don't personally see the need. There are several drippers out there that are set up with 2 negative posts to aid in dual coil set ups, but I think that's just for people who are chasing clouds of vapor. I think the most important thing is good wicking for any set up. You can always adjust your coil resistance.
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