In states like FL where CS is calculated on both parents' incomes, it's easy to calculate the outstanding CS obligation for each party, assuming the month of emancipation for the children. OP may have a higher obligation, but she has one too, even if she is the primary residential parent to whom CS is paid.
I had online access to my insurance policy and could decrement by as little as 1% anytime I liked. So I build a spreadsheet that ran the numbers and time frames for adjustment. Never had to use it, but it's math, and spreadsheets. Cake.
"Personal density is directly proportional to temporal bandwidth."