I guess that means that you ARE paying what's mandated by child support guidelines and you DO waste money on smokes & booze...thanks for clearing that up.

another suggestion, since your apparently sooo open-minded, would be to share an apt. so you can split costs with a roommate oh & purchase a cheaper vehicle that gets better gas mileage or just take the bus if it is too far to bike or walk. Quit smoking & quit drinking, stop eating out, start shopping at Goodwill & the local discount grocery store, quit wasting money on video games, cable and internet as those aren't necessities either.
Your posting on a forum that has a lot of people who really scrimp and work HARD (2 & 3 jobs) just to pay their rent & keep food on the table after they either pay their child support obligation or for lack of receiving ordered child support by a NCP, so it should be expected that many would wonder why YOU CAN'T seem to make it on $1500 a month AFTER paying rent & child support. Since you refuse to address the issue with simple numbers and instead jump on a man-hating bandwagon that was in no way even implied let alone suggested, it's obvious that you were looking to slam the ex-wife for asking you to help support your children when she makes more money than yourself and wanting a legitimate way on how to change the amount that you have been obligated to pay.
As many has said, the only way to lower the support is to file a modification...but if your paying what's mandated in pro-rata to incomes, then it's not going to change anyhow. I'm guessing that your angry that your not getting the answer you want as you have no legal recourse to lower your child support.