Not sure if I've ever had a CBS CX LP but it doesn't sound familiar. I do have a fair amount of LP's that just sit in the collection though so you never know.
When CD sounds better than LP, something went wrong. I have a few that way myself but it's very rare. One that comes to mind is Alice In Chains, Jar of Flies. It's on clear colored vinyl, double album and is completely washed out compared to the CD. I don't know why. It wasn't cheap either.

