If you've thoroughly cleaned out your atty to get the primer out, then I suspect it's the juice you're using. Many of the juices I tried at first had a flowery/perfumey aftertaste. Really nasty. That's when I went to buying a better quality of juices. Most of the Chinese stuff tastes like perfume to me.
Agree, Weird enough, different devices make juice taste different. When I went from KR808 > eGo, my juice ALL tastes different.
I STILL KR808 cartomizers with an adapter, but I believe the difference in the voltage makes for the difference in taste. A LR atty would do the same in concept. (at least in my opinion)
The sort of chemical aftertaste is from Chinese juice. I have NEVER had that problem with ANY OTHER juice. My regular daily vape that I go through 3-5ml a day is actually from India, and is cheap, but does not have the chemical/medicine/alcohol taste to it.