Does that mean Lazeez will visit everyone's site and download anything newer than is on Scifi, or merely that's he'll complain if someone notices a difference? (That seems like a lot of wasted moderator time!)
This actually depends. We're not going to police every author's site. I added this clause because few authors in the past poste on SOL to attract readers to their site, so they kept their own site ahead, all the time. So if I know an author has his own site, and I notice that his postings on SOL are garnering less and less views, then I know something is up and then I just keep an eye on it. If it's too much, then I do take action by copying the files from the author's site over to here.
I'm also nervous about the 'minimum time' restriction. I posted a story to FS which my readers responded poorly to, so I 'unpublished' the work. In that case, I left it up on FS, but I can see yanking it if it'll ultimately affect my other works. I'm taking it such actions are now forbidden on SciFi?
Yes, if you post it, it stays for the duration specified. However, I'm not an unreasonable person, things can be discussed.
What about if Amazon or Lulu launch a complaint about potential copyright violations? Can/should be remove the story until the violation is investigated, or according to the contract simply leave it up since it's already been submitted?
Each case will be considered on its own merits. There is no blanket ironclad non-changeable, non-overrulable rule.