I'm pretty convinced that the nic is the main factor on throat hit. I think PG/VG ratio part contributes only little to TH compared to nic. Some juices tend to have stronger TH though, like Torque 56 from Halo which gives me TH of 12-18mg while being only 6mg. Torque 56 is a real strange juice. Both TH and vapor production far superior than most of other juices I've vaped so far.