stanp Thanks, Stan. Good suggestions. I already tried most of them. Motion comes from a mocap session and the bones seem to move correctly. I would assume the muscle motion is correct because this is an asset setup by Ziva. I tried manually animating the fiber excitation. There isn't an LOA but I will try reducing fiber strength.
I guess I was assuming that the human assets from the store were already set up for proper simulation. We had an education license for use in an anatomy art class and the teacher ran into this problem. I am evaluating them again to see if they are worth the license renewal for the class. I know I must be doing something wrong, but I can't for the life of me figure out what it could be.