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A Simple Finesse of Grand Slam?

This is the last deal in 2017 Michael Seamon JUSBC U26 USA2 Finals.

Board 30
Vul: None
Dealer: East

East:                              East           West
♠ AQ3                            2♣              2♢                       5NT: ♢Q without ♠K
♡ 5                                 3♢              3♡
♢ AKJT84                      3NT            4♢
♣ AKQ                           4NT            5♣
                                      5♡             5NT*
                                       ?

Total IMPs before the last segment is 102:95, a little bit ahead of opponent.
Other boards in the last segment are as followings:
   
     Board 2: Opponents bid a grand slam with a missing key card. Although East makes a lead directing bid, West chooses the wrong suit for leading.
     Board 5: West does a wrong decision from finesse and 3-3, which leads the game contract down.



NOW, THE LAST BOARD COMES !!!
Gambling or not, that is a question. From East's point of view, there is a large chance to bring a grand slam home. If West holds ♡AKQ, if West holds ♡AKXXX and 3 diamond, the grand slam is easy to reach under a normal distribution. The worst situation is a finesse in spade. In such backward circumstance, it is worth to gamble. East bids 6♠ at last and 7♢ becomes the final contract.

The whole cards are as follows:

Lead: ♢2



Trick     1     2     3     4
      1       ♢2  ♢4   ♢9  ♢Q
      2       ♢7  ♢5   ♢A  ♢3
      3       ♢K  ♢6   ♠4  ♣6
      4       ♢J   ♣T   ♡2  ♠2
      5       ♢T  ♣9   ♡9  ♣3
      6       ♢8  ♡7   ♠8  ♣4
      7       ♣A  ♣5   ♣2  ♣7
      8       ♣K  ♡6   ♣J   ♣8
      9       ♣Q ♠5   ♠T   ♡4
     10      ♡5  ♡3   ♡A  ♡J
     11      ♡K  ♠7   ♠3   ♡T
     12      ♠J   ♠9   ?

West wins the ♢Q in hand and draw trumps and clubs in 9 rounds. South follows 3 trumps and 3 clubs as well as discard 2 hearts and a small spade in order.
The last two cards:









It seems to be a simple finesse in spade, however West finds an extra chance, SQUEEZE when South holds both ♠K and 5 cards of heart. Now, South actually holds 5 cards of heart and no one knows it is fortunate or not. The extra chance exactly appears now. How to choose, simple finesse or squeeze?
PS: South is an experienced bridge player.

Obviously, the probability of 4 cards with K is much higher than the one of doubleton K. In addition, South is an experienced bridge player. He will recognize that he will be squeezed in the endplay in an early stage if he holds both ♠K and 5 cards of heart. So he will discard one spade as soon as possible and remain singleton ♠K in a high possibility. Although finesse may be a better choice for declarer, he plays ♠A after a long pause.

The full deal:
Board 30
Vul: None
Dealer: East








East is my partner in primary school. He told me what he could after laying cards was looking up, praying. No one could understand such powerlessness. Success or failure? 14 imps, the cost of gambling, losing 7 imps in total.

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