Fluffy, on 2013-September-18, 10:09, said:
damn, how come nobody jumped to 6♦ with this shape?
[Palm of right hand hitting forehead] Of course! It is so obvious!
I am going to have to reexamine all of the horrible things I posted about this bid in last year's (two years ago?) Spingold (or was it the Vanderbilt?). Ah, yes, I remember it well.
This does appear to be a recurring theme, and 6♦ seems to be the winning call every time.