Hello! My name is Kelly and this is my first week. I've read quite a bit and watched numerous videos and learned a lot but I'm still in the dark about some probably simple things. I have found that the passthrough is great, with an easy pull and great vapor after little effort, but when using the battery with the same cartos I find a hard draw and not much vapor. Incidentally, I have chosen a tobacco flavor to start. After a couple easy draws to prime I find I have to really pull hard to get any reasonable amount of vapor at all. This is with both the new batteries fully charged. From the start the taste is harsh and almost "painful" to my lungs pulling hard. I have adjusted the tightness of the connection and used almost a full 5-pack trying to see if it was maybe a "bad" carto. Would love to use the passthrough all day but that's obviously not possible and I don't know where to turn next. Any suggestions are appreciated! Thanks!