I would say, just vape the VG at night, if that seems to make the difference with PG. And no, PG is not lower quality, some people preffere the way it delivers flavor(I don't), and others prefere the TH(I don't). It's a preference issue. Also, strictlyejuice.com has 30ml of VG juice for $10, although it is high in nic at 36mg. I really like their tobacco flavor VG, their menthol is good too. Niether are hard on my throat. Also, you can get their unflavored VG and get some flavorings for it, and mox w/ a little VG from Whole Foods or the drug store(cheap). If you mix the VG w/ nic 50/50 w/ USP VG it brings the nic to @15mg once you add flavor.
I can definitely see the TH standpoint, the VG I had had great flavor but nonexistant TH. I will definitely check out strictlyejuice.com- that is a great price. As for the mixing tips, thanks a lot for the detail you've given. I have a jumping off point for mixing now, which I've been wanting to start learning. I do have a question about that recipe though. Which part has the nicotine in it? And where do I get that?