I guess you can impute the 400 figure, since there's no other
way for #8 to win.
For #1-#7's wins, and for ALL the posts' losses, you can't derive the numbers (your Item #7), except by charting the games. To me, that would be an impossible task, and I would hope for you, too, you shouldn't have that much time available, even if you're a computer nerd like me.
If you want the computer to do the work, then let the computer do the work!
A database is out of the question - too much work, and you
would need WAY, WAY more data. Don't get me wrong, I would love
to get it if I could.
I'm open to the idea that there could be some merit over the short haul (3 or 4 days) to pick up 'current performance' - even then, you should assign successively less weight to each older performance.
My system uses only win/no-win as the input, although I interpret that differently depending on the game conditions (posts, opposition-and THEIR ratings), I can take a few days off and still get the data I need.