Say no more, I totally understand

. I've "cloud chased" after a good workout before and I know the feeling. It's funny you mentioned VG bothering you because I was about to suggest some pure VG. It feels smoother to me, but I know that "lung coating" feeling your talking about for sure, I just don't have asthma so it feels more like it's just "coating the nicotine throat hit" if that makes sense.
It's funny how different blends effect different people, I always thought that juice was the same no matter what, and it turns out the higher PG I was vaping was what was giving me too much throat hit, and allowing the nicotine to be absorbed too quick (it very well could've been the high nicotine I was vaping though, I went down to 6mg, and it's smooth now whatever the mg level.).
First time I tried Virgin Vapor because I wanted to try an all VG it was a light-bulb moment. The difference to me was like PG is vaping a light vodka, and VG is like vaping a milkshake, just thicker and coated the nicotine in a smooth layer. I definitely know what you mean by the smothering feeling, if I vape it too hard, you can start to feel it build up.