I hate to tell you this but you just guaranteed you will not get your wife to accept less than $1300 even if she is only entitled to less.
NEVER NEVER NEVER make promises except outside the divorce framework. Don’t make anymore promises and make sure your attorney is aware of the most recent “demand and offer).
Remember, child support is a formula based upon income. My guess is that they are not going to input too much income to your wife because of how long it has been since she last worked and the reason for her not working at that time.
However, in most situations, the judge is not going to let her sit on her ass for the rest of her life – especially if you get a halfway decent attorney.
Get an attorney and don’t take any more promises. Trust me, you’ll get an opportunity to write some checks real soon.