Quicksilver, I suspect the reason that you have not had a substantive response from creationists to your questions is that you are being unduly restrictive - SCIENTIFIC evidence. Surely any old story will do, wont it? Independent, verifiable confirmation is so inconvenient. If you don't accept the authority and independence of the bible then you are reducing the Noachian flood to a plagarism of an earlier Babylonian story with a moral message - a parable. Surely you wouldn't expect to find a parable in the bible.
So, loosen up. Give the creationists some wriggle room.
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