Sixty percent of your take home pay????? Who is your lawyer? Are you sure he/she's working for you?
I've been a stay at home mom for 20 years. Even with child support the most I get is 40%.. and I don't have a job and can't supplement the alimony/support without risking a modification to the payments. When my daughter is 21, it goes down to 30%. Spouse is viewed as a highly compensated executive which has it's own standards, but I can't see how that percentage works with a two income family.