I know what you mean -- VG is definitely more oily than PG -- or at least it seems that way
I did a test the other day -- for some backstory, I got the flu last Saturday and the first few days I was too miserable and my throat hurt too much to vape so I didn't, but Monday night and all day Tuesday my throat still burned, but not bad enough that I couldn't vape
what I DID notice is that after a huge coughing fit, my lungs felt clear like I could breathe perfectly -- and as I was sitting there watching TV after clearing my lungs like that, if I took a few hits off my ecig I noticed that my lungs started feeling clogged up a little -- which made me cough again, which really ...... me off because I'd just cleared them and not enough time had passed (in my book) for my sickness to make me cough -- so it seemed like it MUST be coming from the juice
and it seemed to happen much more with VG juices than PG juices... so I decided to do a little test
I got some cotton pads -- those things girls use to take their makeup off -- I got a big pen, took all the guts out of it, put a cotton pad on one end of the empty pen tube and put a rubber band on the cotton pad to hold it in place, then I took 7 HUGE slow draws off some 100% PG juice, blowing each very slowly through the pen with the cotton pad on the opposite end, took the pad off, put a new one on, and did the same thing but with 100% VG juice and compared them
there was no discoloration whatsoever, despite the VG juice being brown (so that's cool), but there was a little wet spot on both, but only on one side of the cotton pad (didn't go through the pad more than 1/3 or 1/2way) -- so, not nearly as much as I thought there might be judging by how much vapor I was blowing through
to me this meant the cotton pad was too thick to really judge the results, so I did the same thing with both juices that I just did with the cotton pads, but this time I used one square of 2-ply toilet paper -- and did 5 hits apiece instead of 7, and the results were much more pronounced
both squares had a spot of what looked like moisture on them, but the one for the PG juice was less than half the size of the one from the VG -- touching it with my finger and then rubbing my thumb and finger together I could tell it wasn't moisture, it was oily! so that's a little strange, since I've heard from some people that we're exhaling water vapor.. the other strange thing was, I watched Conan and by the end of the show it had all evaporated! you couldn't tell there had been anything on either square of TP... so it was all gone after about 20 minutes
so on one hand I was a little concerned that five large hits leaves that much oily residue, because five big hits is maybe a drop, and I do probably 3-4ml a day -- so that's as much as 80 drops...
on the other hand, it seemed heartening that it all disappeared after a few minutes (would this happen in your lungs as well?)
so yeah, I understand where you're coming from -- I have a few questions on this point:
1. is it everyone's experience that VG is more 'oily' than PG
2. do you notice more that VG seems to clog your lungs than PG? (not asking people with PG allergies)
3. is it possible most of the residue left in your lungs from vaping evaporates?
4. does anyone know how effective lungs are at removing oily residue (probably a LOT easier than tar and ash....)
it'd be great to have as close to zero impact from vaping as we can get -- personally, I'd love as much flavor as possible and as much vapor as possible, and I'd like to vape ALL day if I feel like it, but I don't like much throat hit (unless I'm drinkin...) -- so with those preferences, until I came across the sense of getting clogged by VG I felt like my best option was 100% VG juices with double or triple flavor, and relatively low (8 or 12mg) nicotine, but if VG is gonna make it so that I have to constantly deal with coughing up oil or whatever... maybe I'll just go with PG, which I don't like because it dries me out like crazy and has way too much throat hit...
so yeah -- I hope any/all/some of this helped you either get answers or helped others answer YOUR questions