I don't remember Flesh and Blood having any dates, humans got laser weapons so in my canon I saw it set far into the future. More than most the Alien/AVP stories. I think the author said in a interview its after Forever Midnight, not that its a sequel to it, the events of this other novel are never being mentioned or taken in consideration in Flesh and Blood. Well Forever Midnight is set on the 2100s if I remember.
South China Sea is set after the first movie of course, I think 2008 is a good date for it, you can place it anywhere between 2000 and 2010.