Did you get the new versions? Are you sure they're genuine? Vision is plagued by knockoffs. They're all over the place. Plasticky is from insufficient wicking, and primer residue. The new ones are supposed ot have addressed that problem. They probably still need some break in and tweaking when they're new.
Carto tanks are great, but with thick juice and a kGo, you have to do something about that microscopic hole and you better have LR single coil cartos.