Jcharvet, my experience almost duplicates yours. I have the same identical records in some cases where I replaced the record in the 80's, that I originally purchased in 1970, and the 80's record was far superior.
In regard to the CD's there was no similar improvement. Let me clarify that; if the CD was made when they first came out, they simply kept reproducing that bad CD; however, if the CD is of a recent recording, that CD could possibly be better than a lot of LP's; CD's have come a long way.
Enjoy the music.