Personally after a few years of vaping I have settled on a 30PG/ 70VG mix, but I use Subtanks mostly, and different tanks perform differently with PG/VG ratios, so a lot depends on what tank you use and the coil you use. There is no ratio that works for everybody.
ugh Vape Tongue is the worst and I have to be honest, until now I'd actually never heard a term applied to it. I find this happens most with VG liquids. As mentioned above, moving to a different ratio, especially one that's higher in PG usually resolves it for me personally.