I started 80 PG to 20 VG myself, mostly DIY but I find the pre-mixed juices I like Pineapple Milkshake from Zombie-
juice and Wyatt Earp from FreedomsmokeUSA are both 50/50.
I'm thinking perhaps it's because the VG is so much sweeter than PG. Just taste a lil drop on your tongue of each and compare.