Eric,
It will never be identical, for my reason stated above, I'll post it again though:
"The carto's are a bit harsher, what people tend to forget is just like a new atomizer a carto has some primer on it, it's acidic and adds a little bit harsher throat hit to the liquid that's prefilled in a cart vs. what is in the bottle. "
That is the difference in taste. We offer blanks for you to fill yourself though if you don't like the carto's prefilled, and they just came in today I will have them on the site shortly.
On the flip side we don't offer a more "acidic" version of HFC, it's the same it was originally intended to be and we plan on keeping it that way.
Rob