Yes i understand that may take to redo all that they been working...
I will be honest again, ive been playing arena practice more intensively... and it doesnt really feel this way. Its like in the story mode happens more because of the zombie shaking everywhere and you trying to adapt to their movements that your character feels like an uncontrollable jelly.
Another feel is that you can still control what your character do, and depends on your skills to make it look like if they are jelly or not.
Plus opinions:
Blows still dont feel thrown with energy, unless you move your character for it to happen and thats when your character may shake uncontrollably. It something that most allways experienced, thinking that a good blow wont do damage because of its slow speed, but when it lands it even pulls blood out of the injured enemy.
As body, arms holding weapons needs to be like more firm too. I dont know about programing (that i know is hard as fuck and takes infinite knowledge) but maybe adding a limiter on how much your whole character arms and legs can bend while standing or attacking may help.
Just an example: you try to land a stab into the wall... what happens? Your character arms bends and the body keeps like going to the wall (unless you stop it). Possible fix: when the blow lands body and arms get "locked" -within your character- so it may feel like your character body is fully hard when landing that attack and doesnt seem like a jelly with a stick thrown at the wall.
Something that i noticed too is that stabbing is not only improved but a must do attack.