I am building a quad plane based on FT sparrow. The vehicle is good in vertical mode and transitions, but has roll axis oscillation in horizontal flight (mode FBW) I have performed Autotune, but the situation has not improved. I have tried Autotune, but the situation has not improved. Please provide some advice on how to solve the problem, including structural design and PID tuning. The vehicle has v-tail but does not have ailerons.
[movie] https://photos.app.goo.gl/DwuNBtAtwsRz8NyC9
https://photos.app.goo.gl/YvWxNUtrdNx8poEA9
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