I would add a comment but it seems all the bases have been covered. All I can say is that I went through the same kind of thing and it turned out that I had a mix of problems. I was sensitive to PG but can handle a 50/50 mix. I can not tolerate certain flavors from certain vendors even if they 100%VG. Sooooo keep trying out the samplers from different vendors until you find some that you enjoy and that aren't too harsh. There is a good sub-forum that has e-juice reviews.
E-Liquid ReviewsGood luck and cheers.
E-Liquid ReviewsGood luck and cheers.