Thanks for getting back to me with some great things to check.
There are no self intersections on the muscle cache objects. This was one thing I am sure of.
My thinking on different densities was that possibly making the inner layer lighter, may help it respond better to quick movement. I have been playing with a lot of the setting to see what results I get. These settings have given me the best results so far. Even though they may not be the most accurate.
I have removed rest scale per your instruction. Increasing pressure and adding surface tension. The form looks much better now. Thank you. But I am still getting collision failures. Continuing to test....
I do have a lot of attachments on my muscle / bones. Spent a lot of my time the last few weeks adjusting. This has helped a lot.
So, your last post has helped a lot. The fat is looking much better. Just need to figure out what I am doing wrong with the collisions. I notice I get more intersections when I increase the resolution of my Tet mesh. The lower res Tet mesh yields less intersections. Thanks again for the help. I will continue to test settings.