First off, i have to congratulate you on my favorite plugin!
i think i FINALLY found out why large breasted models will have constant oscillation when on their back but SLIGHTLY tilted to one side.
I tried dampers, spring, and finally arrived at colliders.
It seems that the Pectoral 1 collider keeps contacting the shoulder and causes the constant bouncing.
The only way i can reduce it is to reduce the "radius offset" of the collider but then obviously fingers would sink under the skin and stuff.
I just figured I'd bring it to your attention in case you weren't aware of this situation.
I've had to add entries in timeline to switch back and forth but obviously doesn't work in many scenarios.
In this example, the left breast will not stop oscillating because the collider contacts the left shoulder. it doesn't stop until i lower the radius offset to -0.0070 or lower, which is well under the skin at that point.
View attachment 456922