With all the howlin' that goes on about Diamonds banking short, you would think that your post would have brought a flood of responses.
I've measured cushion response on Diamonds, but unfortunately, can't locate my notes on them. As I recall, they are not much different from the following measurements on a GC V, less than a year old:
Impact point=0.5 diamonds (10-5 bank): 3.5 degrees short
Impact point=1.0 diamonds (20-10 bank): 5.5 degrees short
Impact point=1.5 diamonds (30-15 bank): 8.5 degrees short
Impact point=2.0 diamonds (40-20 bank): 8.5 degrees short
Impact point=2.5 diamonds (50-25 bank): 10.5 degrees short
Impact point=3.0 diamonds (30-15 bank): 8.5 degrees short
By way of comparison, my home table with generic k-66 cushions banks "less short", but I can assure you it does not play as well as the GC V. Home table:
Impact point=0.5 diamonds (10-5 bank): 2.0 degrees short
Impact point=1.0 diamonds (20-10 bank): 3.5 degrees short
Impact point=1.5 diamonds (30-15 bank): 5.1 degrees short
Impact point=2.0 diamonds (40-20 bank): 5.8 degrees short
Impact point=2.5 diamonds (50-25 bank): 6.2 degrees short
Impact point=3.0 diamonds (30-15 bank): 6.6 degrees short
I have played on GCs with cushions like rocks and like sponges. Which is why I don't like blanket statements like "Diamonds bank shorter than GC". Because, it all depends which GC you are talking about.