"I have always felt that the costs of the children should be equitable...i.e. the burden of the expenses of the kids should be equitable to both parents."
HOW can you say that? The costs were to be slit 50/50, because he was providing you with a large percentage of your income. Now that he is no longer going to be doing that, you want him to pay a higher percentage of expenses? WHAT!?! Stand up on your own two feet.
I bet if YOUR income went up, you wouldn't be rushing off to court to have YOUR percentage refigured. Stop being such a GREEDY, BLOOD SVCKING person, and just be happy that you GOT SS, and will GET CS, and earn your OWN money.
Why give a "senior" discount, they have had plenty of time to raise the money...