I'm relatively new to e-cigs but I hear you. I can't do straight PG, I tried for over a week and it just dried out my throat really bad and had cotton mouth all day long. Was only vaping it 10-15 times a day like a regular cig. These were three different brands too! So it's certainly all PG that gets me.
I got some Johnson Creek Red Oak Tennessee Cured (all VG) and took away that problem. The flavor is good, but a little too sweet for me and gonna try some other stuff out them and other online shops.
Just trying to find the right flavor and perhaps a 50/50 blend may work out too. I dunno myself however, I am gonna a bunch of VG/PG variations and straight VG.
Good luck man!