Having just recently gone through the D journey myself, I am sorry to see you here.
I am on a fact finding mission, so please bear with me.
If you got full-custody of your kids, how would you care for them?
If your wife did get full custody, do you trust her as a mother to take good care of your kids?
Why do you balk at an amount of CS that the court would deem fair?
The reason I ask this last question is one of legal strategy, and my attny. used it against my XH. The very fact that you would balk indicates that you are more worried about money than you are about your children's well-being... whether the amount is fair or not. It is a slippery slope that you will traverse. Keep this in mind when discussing these things with your attny. I will hold off on more advice at this time... I'm not saying these things to piss you off... but one thing you CAN NOT DO right now is think like a man.
How old are your kids?
What are the laws in your state? Are you in a no-fault state? Are you in a state where you have to be legally separated for a certain time before you D is granted?