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?