I've left all my rebuidable drippers with the airhole they came with, instead of drilling them out. I just prefer a tighter draw, even the standard Kayfun draw is airier than I like. I got a Trident recently which is the first rebuildable with the ability to have a super airy draw for me. I put it on the biggest hole and installed a sub-ohm with 24ga Kanthal. Got out a free-sampe 0 nic juice and did some big ol' lung hits. The cloud capability is crazy, and so is how fast it went through juice. I think 18mg nic would have laid me flat with that extreme amount of vapor.
That was just for fun to try it out. It was fun for several minutes, but not something I really want to do. I really don't want that much vapor on a regular basis, add to the fact that it eats up batteries and drinks up juice so quick. I can see why that appeals to some, but I'm more into great flavor combined with a draw and throat hit that feels right to me, and a decent amount of vapor.
The Kayfun can't really be a super huge cloud machine, but it can give awesome flavor alongside a respectable amount of vapor. I think if you went down to the 1ohm area with 28ga Kanthal and upped the nic you'll be happy.
