I'm not sure why he would say VG is the culprit. ALL of my juice has some VG in it, and I use only blank cartomizers. However, I will say that I've ordered blanks from a lot of different vendors, and CigEasy is the only vendor I have had consistent good results with. Almost every time I order from other vendors, some of the blanks I get have that chemical taste, or the slots are so shallow that there is little to no airflow, or are just functioning poorly right off the bat.
I don't know why that would be the case anyhow as I've now heard that almost all juice has some VG in it. But he claims that's the problem. All I know is they don't perform as well as the ones I got from him in blister packs. These ones are certainly made on the cheap. The wadding isn't packed in there nice and solid like the other ones and the rubber flange/washer thingy doesn't fit inside very well and has the tiniest hole in it so the airflow is crap. The other thing is, if he knew that these cartos don't perform well with VG, why not say so before hand? I'm just guessing here, but I would assume a good 1/3 of vapers use VG or at least some VG in their juice. Maybe more.