the wow cartos dormouse are 2.6 ohm i was told be them, yeah 2.5 ish to 2.8 2.9 seems to be ideal for 3.7 up to 4 wutever volts, and their cool carts are 3.5 or 3.6 I forgot 3.5 i think he said. I just got some horizontal coil coming in that are 2.6 to 2.9 so i am stoked on that. these will def work the best out there, including the dual coil which is also great i hear and can run up to 6v and its funny cuz it will be 1.5 ohm and i didnt get how it wouldnt burn or be harsh on ya, and I called and found out from a nice owner its cus theres two coils which i knew but one is high resis and one is low and they like balance each other out. So you like get the benefits oh a low carto, but with the goodness and protection and some cooling of a high resis, crazzy. I am gonna try these out once too, just to see but the horizontal is soo damn good I wont really dnt need too. Even my vertical ones from nhaler are like ......ed good, sooo.. but yeah the 2 ohm is a lil low for being vertical coil I got. It broke in after a lil, but it was a lil harsher for having pg juice like i had atm and burned up juice lil too quick, but didnt burn up the carto or nothing cuz their made well so that doesnt happen. But yeah you were on point about this and thanx for the help, 2.5 to 2.8 tho to me is like the best cartos range I would say for people to get if getting vert or hortiz reg cartos. In all the dimensions.