Well it could be either or both. I had major issues in the beginning and PEG solved it. Of course, the majority of flavorings are suspended in PG so it could kinda be both at the same time.
I stay below 10% PG I am fine, otherwise not so much. Ideally I would love less fog from my
vape (PG is great for that) but I find PEG400 to be a better flavor carrier. When I was using 90% vg I felt like my flavors were muddier sort of somehow and they were crisper with PEG400 and also ii is LESS viscous than VG only so you don't have the overheating issue.
It's worth a shot. Really. I gotta get some more from River before they run out or whatever. IDK.
Anna