Something weird with calibration

Made a smurf 3 weeks ago. Played ~150 games to get level 50. Played ~130 games in very high with a 63% winrate using mainly supports. I then play calibration games with 9 in high skill and 1 in very high, then calibrate at 3430. Surely if my games are 85% in very high skill, I should of placed above 3.8k at least? I mean I have a 64% in VHS...

I get that I don't have high xpm or high gpm in games, but I have to play support or else we'd have 5 cores.

Anyone else had this happen to them or any information?

http://www.dotabuff.com/players/319738857