Your response is very good and it's neutral enough not to send flaming arrows at his back.
I agree, your lawyer needs to review this and you are entitled to half his retirement and I would go for it. You may want to discuss w/your lawyer how to handle this. Some want their share at the time of the divorce, which means your h would need to take out a loan to pay you off. Others have stipulated in the divorce decree that you are to be paid either in lump sum or monthly upon his retirement.
As for the spousal support, again, don't let your h off...it's more than fair to receive what you are entitled to after 21 years of marriage.
Be prepared for him to get ugly once he discovers that your lawyer has reviewed the document and changes have been made. Right now, he thinks he's got you in his hip pocket. Won't he be the surprised little fool.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.