LS, loaded question with a lot of variables.
I fought for custody because WXW was CLEARLY not good mother material. Semi diagnosed Borderline PD. I had our MC, her IC lined up to testify to such(didn't need it, she *blew up * in court). Our Neighbors testified to her poor parenting skills. I had PI's to testify that she would drop the kids at her parents to go see the OM. Her own parents testified (And in their own words) that I was a *super* father. I had a 9-5 job, I offered *everything* in the way of physical assets for custody. I took college classes in childhood nutrition, early childhood development and to deal with XW, abnormal psych(really needed that one ) Had a parenting plan outlined, daycare and schools lined up. Almost two years, district court, appellate court and the supreme court, later, I had custody.(I won at every level) I also had blown through all of my lifes savings and added $50k to my debt. In short, it wasn't easy.
The courts will consider one thing in determining custody. The phrase *in the best interests of the child* when looking at custody. I will ask you(and this is a very hard question, please look outside your anger) Is she really a *bad* parent? Will your child truly *suffer* harm if she has 50/50 custody, which is the standard default ruling. One issue that will come up is that you have already *shown* you think she is competent. Your child currently *lives* with her correct? By default, her atty will argue that you think her parenting skills are sufficient.
Is this a battle you really feel needs to be fought, or is it punishment for her failure as a wife?