East passed
Sitting South I was dealt the above hand, I considered it to be too strong for a pre-emptive 2♥, but not strong enough to open 1♥, so I passed.
West passed,
and my partner opened 1NT (15 - 17).
Bidding to me - I bid 4♦ (transfer to hearts) and passed my partners 4♥, all pass.
My partner proceeded to make 12 tricks and could have made 13 if he had tried the heart finesse.
Later, when discussing the boards, my partner was questioning whether I could have made more of a move towards slam by using a Jacoby transfer followed by a jump to 4♥, a mild slam try according to our agreements.
Did I under bid (considering this was pairs scoring) ?
Looking forward to your views.

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