I initially tried ordering 100% VG flavors premade and felt the flavor was muted also. I am not allergic to PG but have realized after 2 years of vaping that I tend to prefer a higher VG juice. I DIY usually an 80/20 VG/PG juice using alcohol and VG based organic flavorings. I would say if you can't tolerate PG at all, then get a good alcohol/VG based organic flavor like Natures Flavors, and instead of thinning it with PG, use distilled water. Try to make it an 80/20 measure with whatever percentage flavoring you are using for the mix. I have one flavor that is 20% NF flavors and 80% VG. I have other flavors that only use about 10% of NF flavors, so I substitute the remainder 10% with PG to thin it out. Instead, I guess you could use distilled water, but I haven't tried using distilled water yet. They are good flavors though and that's just what I prefer. And the flavors don't seem to die when I DIY it myself.
Edit...Also, one thing I learned is the alcohol based flavorings give me the throat hit I needed to still use high VG and lower my nic finally. I do like the alcohol based flavorings.