Wow. Your feedback is incredibly useful, I appreciate that very much!!
I agree that signing is a difficult challenge to describe in a novel, so I'm working with a group to discover and invent a method to attempt. One day, we hope to make it happen!
Parts of Eric's trauma- I certainly have a plan for it. Eric (Charos in this case) will have flashbacks that describes the trauma further and much deeper. I believe you (and other readers) will learn more as chapters go by. However, I'm going to take a look at Chapter One and see if I could sneak some details in to give it a little more fuller feeling.
For that specific scene where he get disoriented about gaining speech and hearing- you're correct on that. I'm going to improve on this and sell it stronger! :)
I can see that you have so much to say, perhaps we could take this to somewhere (Telegram perhaps?) and have a productive discussion! Really though, I'm so happy to have this constructive feedback. Thank youu ^_^