I've solved my wicking 'issue'.
Since I got this tank, I've been trying to get it to vape in a specific manner - ie single coil, lots of vapour and ofcourse good flavour.
I started out with single a 3.0mm ID coil, and took out the airflow restrictor. The vapour it produced was just too lean for me.
So I thought maybe a bigger coil (3.5mm) would do the trick. This configuration works for the first few pulls on a freshly filled tank, then again the vapour production would just wither down. Found it to be pretty unsatisfying. I kept on having to open the top fill mid tank, watch it bubble away as the liquid would fully saturate the wick, close it up again then carry on vaping. Again for the next 2 or 3 hits, great vapour/flavour, then it'd whither away again [emoji35]
I figured that the issue was down to me not wicking the thing properly. So I tried everything I could think of or that I read about to improve the wicking. But the wick just wouldn't absorb enough juice for that sweet spot hit.
Today I conceded and thought I'd give the dual deck a try instead.
And now I conclude (from my experience) .. This tank in single coil mode is just not designed to chuck dense clouds with no air restriction. Ie for me, single coil mode is more matched to restricted airflow / MTL mode.
For unrestricted mode, it's got to be the dual coil deck. Kinda makes sense though, the dual coil deck provides for a significantly increased amount of wicking hole area (4 as opposed to 2)...
Now I'm loving it!
I guess it turns out that there isn't any issue with my tank, which for the past few days I though there was. Rather I was trying to get it to do something that it's not designed to do!
I haven't yet tried a single coil with the air restrictor - wondering how that would compare with my good ol serpent mini...
So, I'm still on the hunt for a single coil, cloud chucking, flavour machine. That'll have to wait a few weeks though - I've got an Obs engine on order...