Rich -
You need to get out to more Ross courses.
While he did routings that pivot around high spots, he also loved (and often used) the diagonals that have caught your fancy.
Three of the best holes at the Athens CC (11, 12 and 16) are built diagonally into a hill on the south side of the property.
Nos. 5, 7, 8, 9, 15 and 17 at East Lake are all built on diagonal slopes. To hold No. 5 fairway off the tee, your aim spot is the right rough. On No. 7, comming back the other way, you aim spot is left edge of the fairway.
I could go on.
Come to ATL and I'll give you a tour of local Ross courses based on the theme of "sloped-diagonals."
Bob