Pixhawk hexacopter build, Motors spin slow on full throttle

Hello,

I'm building a hexacopter with a Tarot T960 frame and a Pixhawk.  Here are my other components:

HobbyKing 40A BlueSeries Brushless Speed Controllers

iPower MT4114 320kv

17x55 props

6s Lipo

I've built the thing and gone through ESC calibration withou

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