@burnt2acrisp You are very courageous and have done what really needed to be done. Your strength is to be admired.
About his leaning backward at times: I would suggest you ask for a list of the medications he receives. Some may have a problem like this as a side effect. Or how 2 drugs may interact. It may be worth investigating.
Have you checked to see if the facility has an ombudsman? An ombudsman is someone you can bring a complaint and they investigate. They are usually called after you have tried everything else.
I wish you all the best