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I opened 1NT what do you think of my 3!S bid,
This is a family oriented board, so I can't tell you what I think of your three spade bid in public here (I would have to censor myself). Let's just say not much.
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I really did not like that 2 diamond bid and did not like my chances in NT so went for the moysian fit
4-3 FITS are great when the short hand in "their suit" (here diamonds) is in the short hand with your suit (here spades). In other words if you had one or two diamonds, and three spades, moysein would be a good idea. But when the hand with the four spades (here your partner) is short in diamonds, well that is not good. I will leave it to you to figure out why.
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what is best line to make this 4 spade contract with a 6 diamond lead from east
Play the 2D overcaller for Kx, Qx, or Jx of spades. Win diamond ACE, Club to the ACE, spade with avoidance play on overcaller (8 if he plays small, ACE otherwise. The plan is not to lose a trick to WEST who will capture two diamonds. Then when you get back in cash spade ACE club queen, and try to take 10 tricks (losing 3S). Winning 1S, 2H, 1D, 3C, a club ruff, and two heart ruffs or long trump if they ruff hearts in front of dummy.