While I was making the animation with Cerberus, I checked the functionality of the model as a whole. During the entire animation stage, I encountered only one small but very important problem. Forgot to set the tracking target for auto-rotation on one of the shoulders
You can fix it very quickly on your version just by following the screenshots.
You need to change the "Rotation Z" driver parameters for the bone "shoulderREAD.r", and in the "bone" parameter of the driver, set the bone "shoulderFOLLOW.r".
Update is also already available on google drive.