Roll oscillations, Pixhawk@Twinstar Arduplane 3.5.3

Hi folks,

I have an issue with my Twinstar platform. Generally it is super reliable and stable. Recently I tried a few flights in stronger winds and experienced roll oscillations sporadically. Sometimes they stopped without intervention, sometimes I ewnt to manual for safety reasons. 

See for example this flight, look at 6:44 or 7:37

https://www.youtube.com/watch?v=VGXukgjUpeg

This is one of those events in the Log, Red being Roll, green DesRoll

attachment.php?attachmentid=163524&d=1488040694

I then increased Roll D by 0.01 and got this

attachment.php?attachmentid=163525&d=1488040695&thumb=1

These were my initial PIDs

attachment.php?attachmentid=163526&d=1488040695

So my question is: Is RollD the right parameter to adjust ? Or should I go down with P ? 

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