I think you want to stay away from ultra fires for
vaping, I use them but for something else
and yeah can you show us a pic of your
coils? I use 26 kanthal 6 wraps and get .2ohms and efest 2500 mah 35 amp (yes i know) and will be using sony vtc4 2100 mah 30 amp soon, just ordered 6 of them

and no theyre not fake, bought from a reputable seller
anyways, please post a pic of your coils and if you cant, how many wraps? are the wires VERY close together? what you can do or do going forward, have just the coils on, no cotton, and fire it up, see how long it takes to get red/orange, don't keep it on too long though, this will help confirm why it takes so long, it should light up from the inside to the outside wires if done correctly