Yup, keep it short and to the point. Judges done like to read a bunch of BS but NO, dont be a smart ass. Doesnt score points. You can do it more tactfully and still get the same point across.
I had to do several of them before also. My ex/almost would write 3+ pages of stuff and questions. I would respond with one liners and the judge loved it.
I also agree, keep the anger under check. Get him where it hurts, in the wallet. Sounds like he is a dead beat bad or just doesnt want to part with any money?