I might be misreading your spreadsheet, but if I was trying to win the weekly in round 15, I would prefer not to have players like Oliver and especially Neale. I think you're better off betting against him, either hoping he has a down score, or that you can pick someone much cheaper who can match him, and then make the points back and more by investing that cash elsewhere.
I agree with
@jaca re KPPs ... I'd be grabbing som KPFs with good matchups or POD mids or defs playing weak opposition. Fanfooty has all the info on averages by player against each opponent and at each venue.
If you wanted to be super smart about it you could even consider the weather for your final selections, and maybe work backwards from there on who you are most confident bringing in in earlier rounds.