I have a VG classic and it seems to me that there are always actives left in the leaf after vaping.
I always collect the "leftovers" into a container and keep them for when I want a "buzz light" kind of experience.
If you want to make sure you get all of the actives in the first go, I'd recommend a bong.
I can't say either way when it comes to the GVG.
Convert a melodic element into a rhythmic element...