in the docs there is an eg file for the popshapematch DOP…
the 3 parameters that one may monkey with are
Restoration Strength
Squash Resistance
Frame Drag Strength

playing the simulation with the values in the eg file - 24 for each parameter - gives the same results as values of 100000
lower values seem to give the expected results, although in a strange non-linear fashion…


ps: I seem to recall seeing something about this op in the forums before but I couldn't find it…so sorry if this is a double post)

The strength of those values is clamped to your frame rate. Any higher a value will result in an unstable system that blows up immediately.

The non-linear nature is because they act as scales.