You have superlative taste. I might disagree about some of the more recent artists (but isn't that always the case with new music?). Kudos for "I Fall to Pieces" and Sammi Smith. If you like Patsy Cline, check out Connie Smith (probably the greatest female vocalist of country). https://youtu.be/ceY1EeGsFd4

A few more recommendations from the period you cover:

One musician from the recent past who doesn't get the credit he deserves is Johnny Paycheck. His only hit "Take This Job and Shove It" pales by comparison with his other work. https://youtu.be/CJsMaCoqkkg

Moe Bandy was popular for a good while, but now he's largely ignored except by old fans like me. https://youtu.be/taDUc8ZLQ_E

Three fine contemporary singers / songwriters:

Ward Davis https://youtu.be/fbRCRFBCOGY

Cody Jinks: https://youtu.be/o1OP8L97oeI

Brandi Carlile: https://youtu.be/5r6A2NexF88

Country music has become world music: https://youtu.be/QIJ0Mlb_tDE