I am currently "swinging on the fence" regarding this "High VG" subject. I recently re-made a few of my go-to recipes. I normally use a 45PG/45VG/10H20 base and this time I tried a 19PG/69VG/12H20 base to see how I like a high glycerin mix.
I am not sure what is going on here yet. It seems to me that SOME flavors are either muted OR need more time to steep. I have done a warm water steep for quite some time and this always does the trick with my normal base, but this high VG base truly is different. Before bumping flavoring percentages, I will let them sit longer.
With MY taste perception, flavors like peppermint, cinnamon, menthol and clove come through as they did before, but the tobacco and fruit flavors seem muted, at least for now. Time will tell! {The purpose of this experiment is to see if lowering PG will help with dehydration/dry mouth issues}
-Just my personal experience. Hope this helps!