Glad to hear you loved Yeamans Hall. I've only played it once but that and Garden City are my all-time favorites. #1 is easily my favorite starting hole anywhere. That green has to be seen to be believed, and the tee shot is great too--it's a tough hole, but generous enough so that one can start with a par. It's bold right out of the gates.
The spine green seems to be a theme of Raynor/Banks greens. There were four or five at Hackensack Golf Club in NJ. However, it generally creates great interest and variety on potentially uninteresting holes like number 9.
Not only does the scale of the course get larger throughout the back nine (though I believe the biggest elevation change is on 8 ), the holes get better and better as you go along. The final six are all fantastic, especially 14 (probably the most dramatic greensite anywhere) 17 and 18. I can't say I'm as big a fan of ten as you are. The tee shot just isn't as engaging as it could be. I believe there used to be left fairway bunkering that may get restored, but there isn't a great deal of decision-making off that tee. The green site is unbelievable--one of the best on a course filled with wild greens, but I certainly like holes like 1 and 9 at Garden City, 4 at the Country Club, and 14 at Oak Hill East better as short fours.
I generally agree with you about the Biarritz green, but I found the scale and terrain of 16 at Yeamans Hall wouldn't allow green in front of the swale. I would consider moving green into the swale, but as I remember the current green is already massive and filled with interest.
Also, you forgot to mention the very unique Alps Hole!