First round finesse for the jack

On this board from Saturday afternoon at the Charlottesville sectional, I thought I had made a great play to make 5♣ – I took a first round diamond finesse the right way.
 

Dealer: S Vul: Both	North ♠ AKQ865 ♥ K95 ♦ 72 ♣ 82
West ♠ J7 ♥ AT84 ♦ AT ♣ QJ963		East ♠ 32 ♥ 63 ♦ KQ965 ♣ AKT5
	South ♠ T94 ♥ QJ72 ♦ J843 ♣ 74

South	West	North	East
Pass	1♥	1♠	X
Pass	2♣	2♠	3♠
Pass	4♣	Pass	5♣
Pass	Pass	Pass

1♥ was a canapé opening, X supposedly showed a good hand (2m instead would have been natural and something like 8-11hcp), 2♣ showed longer clubs than hearts. Obviously 3NT, if anyone was brave enough to not bid with the north hand and wait for EW to get to 3NT, would go down two. In 5♣, we needed to pick up 5 diamond tricks to make the contract. Given the bidding it’s favorite for south to have 4 diamonds and therefore makes it the percentage play to make the contract is to finesse him for the J rather than play to drop J, Jx, or Jxx, but you’ll go down two when it is wrong. Going down at all will surely get a below average score because a significant number of people surely won’t get to game so I think the first round finesse is definitely correct here. 5♣ making was worth 11 matchpoints out of 12.

It surprises me is that no east-west pair went minus on this board. There were 3 600’s, 7 150’s (4♣ making 5), 2 130’s (4♣ making), and a 100 (3♠ down 1). But what surprises me even more is that 10 out of the 12 declarers made 5 and the only way to make 5 is to take a first round diamond finesse for the jack. Well, maybe the 150’s and 600’s are actually people in NT getting a non-spade lead. In that case, there are 9 top tricks and it would definitely be too risky to finesse in diamonds.

Meg and I wound up with a slew of 3^rd place finishes in the pair games and somehow were 2^nd in the Swiss with a meager 3.5 wins out of 6 and 67 VP. Not quite as good as the 2^nd, 5^th, 1^st, and 1^st we had at the slightly larger Macon sectional in January, but not bad.