Not trying to create a problem, but legally each parent has the same rights as far as custody so 50/50 is the legal starting point. There is no legal assumption of one parent being more qualified or a "better" parent. The welfare of the kids is paramount in the eyes of the court and usually the decision they make is what the evaluator feels will be most healthy and stable for the kids. When parents are at odds about what that is or looks like, usually the courts will more or less not consider the parents opinion and rely mainly on outside opinions/evaluations. The final decision many times isn't what at least one of the parents think is best for the kids or how it "should be".
Line up outside support to back you and deposition them. Search and find all the state guidelines and know them and use them to the best advantage that you can.
Best of luck and wishes.
Signed, Dad who filed for divorce, kicked wife out of house, and has custody of our kids.