Sankara, I used 4 strands of 30g kanthal. I've found it's too thick for the OCC heads (I only have the Nano tank right now - I'm looking at a Mini, though as the full-sized is just too big for me.) My resistance readings were all over the board when I'd fire it (was trying around 20W) One nice hit, and then a bunch of burnt hits. I'm going to have to back off and either try a parallel (two strands of 30g) or two strands twisted. I won't be able to get the ohms low enough, but that's o.k.
I have a couple of kayfun (clones). I have the 4-strand on one of them right now, and it's pretty nice. I think it meters out to about 0.8-0.9 ohms. Running it about 15W. I like playing with different builds, now that I'm starting to get a little better. I'd struggled with wicking issues until I finally started building bigger coils (was doing 1/16" micro coils, but too many dry hits.) Now at least 3/32", but more like 1/8" and organic cotton.
My daily tanks are the PT2s!!! I don't have any problems with them. I have been rebuilding the heads - no leaking, no gurgling, no dry hits.... I do have the airflow controllers on them, and I think that's made a huge difference.
I'd be curious to see the RBA deck of the ST or the ST Mini....