1)
1♥ 1♠
3♠
West had
♠QT65 ♥AQJ6 ♦AQ4 ♣J9
I think this is a raise to 2♠. In my mind, that shows say 14-17 TP. Standard players are used to raising with weaker hands and think they need to jump with this.
2)
1♦ 1♠
3♣*
3♣ was a mini-splinter. This is a reasonable treatment that makes some sense playing a strong notrump. The down-side is that 2♣ instead is forcing, which pressurises the auction, since responder must bid on weak hands that prefer clubs and opener has to play catch-up with strong jump shift hands.
West had
♠JT65 ♥AJ4 ♦AQJ75 ♣9
Again, I submit that - while 3♣ is okay - this is a raise to 2♠ in a weak notrump system, when combined with a forcing 2NT from responder.
On the actual, 3♠ was one off
3)
Scoring: IMP
1♥ 1♠
2♠ No
I like 2♠ though 2♣ would have worked. East might pass 2♠ if not vul but this hand is clearly worth an invite Vul at IMPs. Yet East passed quickly, coming from a Standard background.

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