Elevon oscillation plus compass problem

ArduPlane Plane 3.8
1

I have a Pixhawk on a large wing so using elevons. I ran Autotune and it seems pretty good but about 25 minutes into an Auto flight I got a bit of oscillation. being elevons it’s more difficult to tell if it’s roll or pitch but it looks like roll to me. Have a look at the video on YouTube https://youtu.be/yKi6KQ3VrBM

PID values after Autotune below too. Some well above recommended max.

2nd issue is after a few minutes into a flight I get the Error Compass Variance warning. The compass is configured OK (external only) and Onboard Mag Calibration completed. See photo below. Any ideas?

Opterra%20autotune

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2018-07-05 20.34.11.jpg1415×1045 535 KB

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2nd issue is often caused by ones power wires too close to one of the compasses so it’s fine on the ground but creates a variation in flight.

Can’t view the video but wings especially big ones, can “zagi-flap” at speed, caused by the wing not being stiff enough or elevons having too much play.

Can you post a log?

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