Trying to Settle for Joint

[mn_dad]

We did a private evaluation because mom felt that she would be awarded full custody.  I was the primary parent for most of our child's life, but they dragged it out long enough for her to become involved.  

Mom has other children, this is my first.  The custody person felt she had an edge on me due to her other kids, but recommended 50/50.  I feel mom is now trying to dictate the terms to limit my time with our young child with the hope of finding a way to eventually get full custody.  She is threatening trial.

What can I do to help get her to settle for 50/50 and end the games?