Stock
coils seem to do that with aspire and kanger. It's not a big deal on my nautilus' as there is very little difference in performance from 1.8 to 2 ohm. It annoys me on my subtanks though because there is a world of difference between even a .5 to a .6ohm reading.
Not that their .5ohm stuff ever read that low. They always start at like 1 and then after you fire them a few times will drop to .6 or .7
Just another reason I like the rba section. If I build it to 0.5 that's what it stays at unless it gets dropped or something.