Which games to use in Fantasy LCS?

I ended up getting 47.96 points on loulex this week because it counted the first 2 games instead of the best 2 games. If it had counted the best 2 games he would have scored 86.56, which is a far better score and it more accurately showed how he performed as well. The quadra he got on Kha'zix in the 3rd game increased his points so much but it was pointless for the Fantasy