Good Morning Chris,
I have sent you a link with two versions. Please have a look.
Since the dynamic is only short, and its second part is mainly to ‘reset’ I have included a second option, which I think allows for a much better art direction that Dynamics does. For anyone else reading along, the Character partially explodes, and after a short time, all parts fly back to the original state.
I find to use the Target Effector, set to Repel, as well as some other Effectors (Random and Delay) to produce a similar effect. As you are the art-director, you might tweak everything, of course.
The Dynamic part, as you can see, is now without any of the jerky rotations. I just increased for a moment the Force: Follow and Damping parameters.
Xpresso has no options to Ease-Ease that Transition time.
The Constrain Parent Tags are all set to Priority Expression 0, for the members of the Fracture Group. It should be a tiny little bit higher than the Priority of any related object in the Character Set up if the Character is not run by an Animation Clip. Perhaps, select all of these in the Fracture group, select one a single object, and Main Menu> Select> Selection Object. (In the list, delete the object, as it is the work-around dummy to get a tag-based selection)
Now you can quickly reselect all fo those, and perhaps set them to Expression 50, while checking the refresh boxes Camera / Frame). You need to know the priorities of your project, that is part of the job. Write them down on a piece of paper, like a tree, so what comes first (trunk), second (branch), third (Twig), etc. This just works, I know, but it needs to be done by the artist; otherwise, you will run in a life long dependency.
Please have a look at the example file, which represents a simplified set up of your scene. I did not use any transition here. The Dampening was set to 100% where I liked to have the return of the clones later on. (Just to be clear, I do not expect a ‘return’ from the Dampening, it is just a preparation.) Then The MoGraph Cache was used. Explore the Playback tab for the exact setup. You can’t set any curve on this directly, but you can set more or fewer keyframes to shape an ease-ease behavior.
Scene file
https://www.amazon.com/clouddrive/share/HfEh6i8f6hBsQl8x3KIWGlY0W8HEcAo3QAkgVKqxrz9
All the best