APM Arducopter 2.6 on my SK450 Testing. Total Fail. Crash and still flies with bent Props.

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I had this controller running perfectly the previous night. RTL. Loiter. All great. Today Total fail. The Baro seemed to be calibrated for -3m not +3m. All suggestions welcome. Crash at the end was caused by the Q Brain 4 x 20a ESCs. Was flying a bit radicallly for it to respond I think.
I replaced the QBrain with UBEC escs and it flys brilliantly now.
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