I built a Quadplane based on the Fx-79 delta wing. In QHOVER mode it takes off and flies pretty well, but when the transition to fixed-wing finishes the plane starts to oscillate pitch increasingly (I have to come back to QHOVER mode to avoid crashing).

I thought it might be a gains problem, but I wouldn't like to try an autotune without being sure of the presence of other misconfigurations.

My current gains for pitch are

PTCH2SRV_P 1.1
PTCH2SRV_D 0.02
PTCH2SRV_I 0.15
MIXING_GAIN 0.8

I'm sharing a couple of flights where the oscillation is noticeable (parameters and logs included).

Download logs here (35MB)

Any advice to address the problem?

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