Let me start off by saying, that I am anti-ex wife.
I just recently went through a divorce, and got raked through the coals, and because of that, I ( up untill now ), have not felt sorry for the ex wives ( when children are involved )
That being said.....
You are getting skrewed.
Yeah, the $1,300 seems pretty good.
But, here's some of the things you need to think about....
1) When will he have the children on a week to week basis.
2) What about holidays?
3) You need wording in the divorce settlement, that says how often the child support will be re calculated. If he hits the lottery, or gets a good paying job, he will need to pay more
4) What about out of pocket medical expenses. Will it be 50/50? If you don't word it correctly, and Jr. needs a full set of braces, YOU will be paying for it, because YOU have primary physical custody.
The fact that you are using the same lawyer, as him, is concerning, to say the least. Of course he will represent you, as long as the father gets what he wants. That's a no brainer, slam dunk easy win for them.
You can get a lawyer, for free, based on your disability and income. You just need to put in the effort, and look. Call your child support system, and see if they can point you in the right direction. Help is avaiable to you, if you look for it. Remember, you need to find the help, the help won't find you.
Moving on...
You will most likely not be able to touch his retirement.
5 years is a short term marraige, you are not entitled to anything concerning retirement.
He does not have to keep you on his health insurance, if the health care provider does not allow it. Once youre divorced, your off. You children on the other hand, may stay on his health insurance.
The courts dont care why you are getting divorced. It doesn't matter if he has a girlfriend or not. About your recording the phone conversations....
Some states it's legal, some states it's not. Check this website for more info on your state...
http://www.callcorder.com/phone-reco...aw-america.htm
Get yourself a lawyer.

