APM controlled quadcopter flipping on high throttle

Hi,

I'm having some issues with a quadcopter i'm building. Here is the spec:

2217q 880kv motors with 10x45 props

S500 frame with PDB

30A quattro 4in1 ESC (I've also tried individual SimonK escs with no difference)

APM2.8 hardware with external compass and

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