I pretty much agree with your list. I thought I remember seeing that most pollsters thought Nixon had the edge in Texas in 1968, with Humphrey carrying it a bit of a surprise even though the LBJ machine was just enough to tip it to him. I guess 1976 could be argued a tossup, considering how much ground the Democrats had to make up from Nixon carrying the state by a 2 to 1 margin.
The Wiki article said in 1976 Carter underperformed expectations in Texas and it was expected for 1976 to result in Massive Shifts in the South.