only 3 factors should really play a roll 1. ONLY use temp mode for Ni and Ti
coils NOTHING ELSE, ONLY USE wattage mode for kanthal
coils 2. are you using the correct temps? too high of a temp will burn your cotton 3. not sure on this one but did you lock the settings? i have the evic vt never used temp mode so i wouldn't know but wattage mode i know you dont need to lock settings.
if using pre built
coils chances are your going to need to use a lower temp because i find that pre built coils tend to suck as far as wicking goes can barely run them at 25watts for the most part without it getting charred versus my rda and rta i can run at 25 at the lowest and go up to 50's