looks like your problem could be airflow, you could try the cotton through the coil method and dont use too much cotton, sometimes less is more with it, ill try get a picture of my twisted 28g microcoil and the way i have the cotton setup, there is an air channel right under the coil and above it and i get massive flavour, decent throat hit an clouds of vapour, im only running it at 1.3ohms single coil too, i was finding my dual coil sub ohm builds were a little harsh on my throat while ive got the manflu, switched it up to single coil and it was performing not quite as well but was staying cooler for my throat.