I tried a lot of coils, dual, single, sub-ohm, 1.3 Ohms etc. in the last few weeks using 28ga and 2mm, 2.4mm and 1.5mm coil diameter.
Ironically, the best result with my Kayfun Lite V2 is with a standard micro (?) coil, about 8ish wraps at 1.3 Ohms AND a "normal" but picture perfect wick, using...