Heyya.. im currently using the subox mini.. i dont use the occ coils at all.. i use the rba.. 26g kanthal at 5 wraps gets u about 0.54 to 0.59 ohm on average.. settings i use are 17.5w with smallest air hole.. no problem with that. If i go up to 20-25w, i use the medium air hole and a max of 27.5w with fully open air hole... all this settings have yet to give me the burnt taste so far.. as soon as i go for 30w on the fully open air hole, the burnt taste starts to happen..