The system is taking its behavior score very much into consideration. 6,000 is neutral, any value above that the system will force you to win and smaller values will force you to lose. That is, only calibrate when your score is greater than 8,000. I did 10 non-smurf accounts, playing the way I always did, but in 5 of them my score was 3000 because pick techies and in the other only supports known as lion and ogre, keeping score of 9000, with the same winrate before calibrating. After calibration the low score accounts fell as Archon and the others as Ancient. Valve clearly doesn't know what to do with the game. I played techies as support 4 and the others as support 5. I have 78% winrate of techies. 48% others.