The difference between the original coils and the upgraded versions can be distinguished by the wicks.Bought from VK, so I hope it is. Came in white packaging. Didn't order the upgraded coils, only found out later from @PeterHarris that it is.
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On the older type coil, the wicks are visible, protruding from the bottom of the coil on the sides. The 'upgraded' coils only have 2 holes on each side, allowing juice to flow into a little metal chamber, in which the coils and wick is situated. I have only used the older type coil in my mini pt3, however, i do know of a few people using the new type coil, and have only heard good things. The only thing i can think of right now is that perhaps the coil isn't tightened enough, and maybe there is a tiny gap where the juice can escape through ?