It's not the way we're doing it but it's a good compare. Always check out the rating / ppm of the second best player, that's how i do it and get less deaths than time got minutes + (depends on rating) get a multiplier of the time in kills
We're very sorry about the downtime we had a few days ago, but it concerned every player playing in this time, so we can not consider a single player.
It depends on average rating, might be that sky-e has more visitors with a high rating in the time you rated than fa#2 got, which is currently always full of players with lower rating (that's the reason why raters visit fa#2).