Not good enough

I have a new high score in the category "out of first place by more than a board". Last night in an 8 table club game we finished at 68.90%. But the winners (also sitting our direction) had over 73%. Still it's hard to complain given my previous two efforts at the club. I thought we bid this hand nicely:

S AJ9732	KQ8
H KQ74	A6532
D void	KJ10
C A98	65

1S - 2H;
3H - 3S;
5D - 6C;
7H - P

After finding out about the double fit, partner launched into exclusion RKC. I showed two with the queen. (We don't have any special agreements about double fits, so this was just for spades.) She then placed the contract in the correct fit. 7H is cold (trump not 4-0) since you have six spades, five hearts, one club, and one diamond ruff. But you only make 6S since you're ruffing diamonds with the short trump instead of the long ones. Surprisingly we were the only pair in hearts, although some people made all the tricks in spades on a diamond lead.

Interestingly, you don't "need" the diamond honors to make the grand in hearts. But if you don't have them, it's very hard to discover everything in time because you don't get to start with a two-over-one bid. If you change the hand to three small diamonds, can you get there after 1S - 1NT - 2H?