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20inch props CoaxCopter tuning issue

Hi everyone. I got the CoaxCopter ready for a maiden but I am a bit lost on the tuning. I am doing in in Stabilize and the Yaw feels beautifully responsive (expected) but Pitch and Roll are uncontrolable: seems they overshoot.

Any advice on the method or should I follow one of the traditional quadcopter tuning methods?

Servers by jDrones