Please take this advice with the good intent it is delivered with, and note that this is not mutually exclusive with the “get an attorney” advice given above. Also, my suggestion may be obvious so forgive that…
Your sincere and impassioned case received the support of nearly everyone on this forum. Have you tried making that same case, that same way, to your ex? At some point in time you thought they were a good person, maybe there is some of that still there? This does affect your kid, after all. Maybe the attorney is calling the shots and the ex just didn’t think this through?
I know divorce is not business, but often times in negotiations, people don’t get things simply because they do not ask, or if they do ask, it is combative rather than reasonable. Also, attorneys ask for unreasonable things with the strategy of being able to give them up in exchange for other things later.
I sincerely wish you all the luck in the world with this, and if the above does not work, agree you should fight hard.