Where I live, support is based on a calculator. It's done by how much each of you takes home and takes into account the amount spent on child care and health insurance. I intend to include verbiage that says that if either one of us gets a raise, the support has to be recalculated in 30 days. Not sure that helps you but it should be a ratio of his vs her salary. My sister's ex makes almost $500k/year and he pays support plus 85% of expenses b/c my sister is a teacher and he outmakes her by more than 10 to 1. She also get a pre-tax percentage of his bonuses. Just food for thought.

Your children should not have to change their lifestyle because he decided to leave. That's HIS problem. They should not have to suffer because of his poor choices.

GG

You're braver than you believe, stronger than you seem, and smarter than you think.
-Christopher Robin to Pooh

Romans 12:12 Rejoice in your hope, be patient in suffering, persevere in prayer.