Based on your question, I am guessing you do not have an attorney. Hire one now.
It is hard to say what their reasoning is behind the overtime issue, but an attorney will be able to sort it out for you.
The law is 28% of the net. You should have a lawyer. It makes no sense not to since the other lawyer is trying to take advantage of the fact that you are not represented. This is a bunch of hogwash what the lawyer is telling you.
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The 28% of his net is the statutory amount for two children. It is unclear why his attorney is attempting to deviate from that. You should consult an attorney to find out what the specifics are in your case.