With the new information that I am reactive to bright Virginia, I have revisited what I could try of my GLP stash.
Discarding everything that contained bright Virginia, I was left with.. only Quiet Nights. Upon reopening the jar after a few weeks, I found that the off putting smell I had initially experienced was all but gone. I'm no scientist and can't tell you how that works, but I'm glad it worked out that way.
Fast forwarding to the smoke.. what can I say? It's great. Full flavored, dynamic, checks all the boxes. Very pleased to have been so wrong about a tobacco.
With that said, I went back to all my C&D blends, and they still all smelled markedly unpleasant and vaguely of mildew. Maybe I should give C&D a fair shake and try a tin, as I've only bought their bulk blends up until now.
For now, I am open minded once again about GLP blends, and will perhaps try to pick up the others that contain no bright Virginia, give them a few weeks rest in a mason jar, and see how I like them.