A troubling phrase is in your post...."her mecdiator". That really isn't how the mediation thing works. A mediator is neither hers nor yours. They are impartial. If the mediator you are using isn't impartial.....run away.
As far as the CS goes, fair has nothing to do with it. It is a statutory calculation based on percentage of time with each parent and income percentages. If you are doing 50/50 with the kids and your incomes are equal, it is a wash. If you go on line to your state's laws, you should be able to do the exact calculation yourself. I did that so I knewe the figure long before one was proposed.
Me: 44 S: 17 and 7 Final-6-13-08 I once went to a psychic who told me I would soon feel cheated......