I'm also one of many here who have been having Quality problems with Kanger
coils. I've been getting them from a local B&M and most of them are duds, and its not a pin problem on my PVs. THey're labeled KangerTechs, though I suppose they could have been clones.
If you peruse the forums for them, its an increasing theme.
A year ago I the PT and EVOD heads were fine and I have a mess of them to rebuild, but when I got some T3 types this year, a functional head was hard to find.
Perhaps some vendors have older stock, and therefore decent heads.