Okay, I take back what I said. Looks like the kayfun doesn't really work well on it. Actually, as a matter of fact, the kayfun v4 isn't quite TC compatible on any mods.
I realized my findings were incorrect when I reattached my rda. It works perfectly again....
The inconsistencies are still there but at least the high,mid and low settings are working as they should. Hmm, I'm still assuming it's another way of temperature 'guessing' .. It really depends on your build , coil and etc.
If you're using the mega tank, you have nothing to worry about. It works like a charm right off the bat. As they claimed in their specification, it does TC.