Think West has a pretty clear upgrade to 2N with a good five card suit, three aces, and useful spot cards. What east then does depends on methods, if there is a sophisticated way to show that hand then so be it, but I think 2N - 6C is a practical auction absent high level methods.
I agree that X was a mistake, I think it was an auto instinct to X with 4 other major, but it's clearly a mistake. I doubled and partner reasonably passed, that was -1. 5D was cold.
When you play in small fields with and against weak opposition you're bound to have a few random results. 4S here is not a good contract at MP, needs club and spade onside and hearts to be guessed correctly. I would either seek a better standard game/partner, or just ignore the results as really in such a weak field they're pretty meaningless.
It’s clear you have the king if you didn’t u would’ve given P a trump promotion by playing a third club. You should still play a club at trick 4 no reason why the 9 and 6 of spades couldn’t be switched for example.
I polled it on BW, at the time of writing 21 votes for 3C, 2 votes for 1C, no votes for anything else ... http://bridgewinners.com/article/view/bidding-problem-2-5qpq97mos8/