I have a UFS on its way now, and I have few questions I would like to ask. If you look at the below picture of a boge carto:

You can notice that there is an opening around the center pin. PLUS there is a seal further up, but the seal is after the two small air holes. So the design I would assume allows air to go through the center only, air going through the holes, travels downwards and through the center as well. And here is my question:
1- If liquid control is open, I know liquid travels through the two holes, but does the liquid also make its way through the interconnected threads of the center pin and the UFS connector? If it does then liquid control would just make liquid go through the UFS connector down to the collector tank. No liquid would go upwards to the filler since there is a seal after the holes. I have read a lot of people having leaking issues and I think this design of Boge carto would cause it no? Since i know in other attys/cartos, the seal is at the edge and not inside, therefore liquid from the holes find its way up the filler and not towards the center hole.
Does all this make sense? Is anyone using this kind of cartomizer successfully and how would that be possible without all the liquid going down into the collector tank?
2- Using UFS mouthpiece vs using a regular mouthpiece with the top cap on. Any difference in vaping experience?

You can notice that there is an opening around the center pin. PLUS there is a seal further up, but the seal is after the two small air holes. So the design I would assume allows air to go through the center only, air going through the holes, travels downwards and through the center as well. And here is my question:
1- If liquid control is open, I know liquid travels through the two holes, but does the liquid also make its way through the interconnected threads of the center pin and the UFS connector? If it does then liquid control would just make liquid go through the UFS connector down to the collector tank. No liquid would go upwards to the filler since there is a seal after the holes. I have read a lot of people having leaking issues and I think this design of Boge carto would cause it no? Since i know in other attys/cartos, the seal is at the edge and not inside, therefore liquid from the holes find its way up the filler and not towards the center hole.
Does all this make sense? Is anyone using this kind of cartomizer successfully and how would that be possible without all the liquid going down into the collector tank?
2- Using UFS mouthpiece vs using a regular mouthpiece with the top cap on. Any difference in vaping experience?
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