They use straight PG.
PG is known for flavor. (vg for vapor)
I've never had problems with TH from LX. In fact, if anything, I find it's too much TH at times. I adjust by making sure I have various MG's on hand for various tyes of days.
Sorry you're disappointed in your batch. What MG did you get? Are you taking slow easy draws? Are you letting it sit too long in cheeks before inhaling? (I have to let it sit awhile before inhaling or it hits too hard).
Did you write LX and let them know your particular concerns? Perhaps it's the batch of cartos or whatever. It's not unheard of to get not so good cartos from anybody anywhere due to the mass production of them. LX seems to have a pretty consistent base though, so I'm sure they'd appreciate feedback so they'll know when a batch of cartos or lkiquid is "off".