Weird behaviour. Not sure if a bug or wrong settings

[nakedfighter3d]

I have a feeling that my jiggles don't behave as intended. Even slow and gentle movements cause trembling & jumping. It's hard to see on the video because of slower framerates but in the game/editor, it feels worse. I got similar movement results when my scripts had some kind of Update/LateUpdate transform fighting, I wonder if it could be also the case where something didn't work as it should. No matter how I tweak settings, I can't get any "non-jumpy jiggly" look.

Tweaked setup, Friction = 0.4; Angle Elasticity = 0.7; Length Elasticity = 0.3; Elasticity Soften = 0.5;

JiggleGoesMad.mp4

Out of the box "BreastLarge" settings from the examples.

JiggleDefault.mp4

My breast bones have no animations, JiggleRig builder is attached to the character root, Interpolate = enabled.