Ranked MMR Calibration is extremely broken...

Started a new account a couple weeks ago to smurf and do some all hero challenge... It took me 148 games to reach Experience Trophy level 50. Out of those 148 games, I played 84 High Skill (~3300-3700) games, 57 Very High Skill games (>3700), 6 Normal Skill (<3300) games.

My last 60 or so unranked games, I had been placed exclusively in Very High skill games. In the 57 very high skill games, I had a 58% winrate, not amazing, but I was exclusively doing all hero challenge, no regard for counterpicks or if the hero fit in the game. So, my first ranked calibration game was a 3600 average mmr game. I played support Venge with a support CM partner, dual roamed, crushed every lane, and won in 25 minutes, mainly due to our support play. Our Anti Mage had 2.9k hero damage and was raving about how he didn't even have to do anything the whole game and how he was commending both supports. My next ranked calibration game was a 3400 mmr game, a 200 mmr drop after a 25 minute stomp... In this game, I played offlane Slardar, did reasonably well, hit my timings, set up kills, and we won in 31 minutes. After another pretty big stomp, my next ranked calibration game was at 3200 average mmr, another 200 mmr drop. So two games, total of 56 minutes, both stomps, and my calibration dropped 400 mmr. After two more support games, and more calibration drops, down to 3100 mmr, I decided to play core to see if I could get some of the mmr back. I played Juggernaut, had 200 cs in 30 minutes (629 gpm, not great I know, but we were crushing and I was hitting towers a lot), and we stomped. After this game, my calibration was still around 3100...

This same thing happened to me on my last account, but I played extremely poorly during the calibration games, and had played half and half normal and high skill games during my unranked games, so I figured it wasn't too far off. However, I feel like this time I'm just being absolutely fucked... How can my calibration drop to a point that I haven't been playing games at since my first 5 unranked games? I played 143 straight games at a higher skill bracket than this, and after a 5-2 record in 7 calibration games, I've somehow dropped into this bracket...?

Dotabuff: http://www.dotabuff.com/players/311399364

TLDR; BabyRaging cause calibration system makes no fucking sense, dropped 600 mmr since starting my calibration games even after a 5-2 record and playing reasonably well (even playing arguably better in the higher skill games cause teammates more widely understand the game, making it much easier to play)