myke, thanks for keeping us on topic lol.
I see why you are running at 3.9v. something is weird about the hana. I usually like 5+v,even over 6v. at 5v it is literally burning my mouth and certainly lips. at 5.4v the juice and/or wick starts burning. I am running it at 4.3v and quite frankly that is hot for my taste. that is not so with other devices. this thing is potent. I really do not want to run it flashing out of regulation. to me at least that is not the best use of something with such good regulation. of course I will probably be back here tomorrow saying I am at 3.9v as well

that's a long haul from 6.3v where I started on this this thing. burning myself kind of ruins the party in my mouth/lungs though. actually that might be worse for me than those stinky cigars I used to smoke!
I am using a huge titanium tip my friend milled for me. it is getting too hot even. I think that should probably be a warning. I tried a delrin adapter but it does not want to fit in the kayfun. it barely fits the Russian. actually I think the Russian does work better with the hana but I am not sure yet. the taste seems better but the volume is less. I am a clouds of vapor king of guy. I could get more production with silica but I like how the ceramic lasts because I am old and lazy(j/k).
I also noticed as I mentioned at 5v+ the hana is getting hot. I mean the whole thing. I guess just because it can do it doe4sn't mean I should. I can't imagine who vapes at 120 watts with a flame coming off the wick haha. well that's lucky because now I know I am not even going to use 12 watts. I was buying mech mods daily before. seriously since I got this I did not buy another and really I am set.