Hopefully a quick and easy one for anyone that's used the FEM solvers more than I have.

Trying to add an FEM sim on top of an animation to capture deformation and soft-body collisions. However an issue I'm occasionally running into is a few of the tets getting caught inside the colliding geometry and stretching out to absurdity until they snap back. Image attached.

The collision geometry is a relatively complicated, but smooth, watertight mesh. I've tried increasing the FEM solver substeps all the way to 20, which hasn't had an effect on the issue and increasing the number of collision passes seems to have only made it worse.

Both objects have no friction, so there really should be minimal catching and pulling like this. What's the best way of going about avoiding this kind of thing?