What if % premade was only counted in the past 10 games. I have 200+ games under my belt, and only 20-30 of the most recent with a premade, no more then 10 with the same 2 players (10+ people I play with). If you didn't see my clan tag it would not be obvious by stats that we're a premade.
If 3 or more of your past 10 games were with the same person you are a premade... you both know how each other play and can coordinate better then 2 random people. Instead of listing percent (easily skewed) you would post "premade size" 0,1,2,3 or 4 of the players on my current team have been on my team in 3 or more of my past 10 (or 20, ect) games.
One more thing, is that I need to be able to qualify the sim speeds of players before starting a game. I have been in a number of games, where the sim speed of players was 1 at the beginning of the game. Needless to say, as the game progessed, it became a slideshow. Too many players are making all players suffer because they chose a map or graphics setting for which their system isn't suitable.
I will paypal you $20 Frogboy if you get us "% games with negative simspeed" in there as well