Anyone using notch filter? I'm having bad results

My issue though is that as soon as I enable it, the HUD spins. the IMU is not happy.
It’s the same as what was happening to Paul, and you linked to his post in your thread last year:

So there is no testing of flight characteristics at all… It just doesn’t work.
My loop rate is at 400, and CPU load at about 23, so that’s not the issue.

I guess I should mention, this is on Master, not 3.6.