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Quad trembling (Small but fast oscillations) when in loiter mode

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Hi all!

I have a large quadcopter platform (28" props) and am having trouble getting a stable “clean” hover in Loiter mode.
In Stabilize mode the UAV flies perfectly and feels really good, but, when I switch to Loiter, the UAV is controllable but has very fast and small oscillations when hovering.
I tried lowering the PSC_POS and PSC_VELXY, and it looks better, but the UAV does not maintain its position very well.

After some research in the forum, I saw that the cause could be vibrations, but I can’t tell what the acceptable values for vibration are. The wiki says, “Vibration levels below 30m/s/s are normally acceptable,” but in the forum, I saw some comments that 30m/s/s are not really good values and can cause some problems.

Any suggestions on what to do here?

The flight log is attached:

Thank you,

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