What you have is pretty standard NCP visitation.
Custody has already been decided and you cannot force Mom to comply with your wishes. If she's offering you more time than you have now, you might want to take whatever it is she's offering. Being stubborn is NOT going to help you.
In order to change custody, you need to show a change of circumstance. So what has changed? Why would equal physical custody be in the CHILD'S best interest at this point? Remembering that this isn't about you.
Note that getting a judge to order 50:50 is VERY unlikely unless Mom agrees. 50:50 doesn't work unless the parents are both committed to making it work.
Mom is offering Wednesday nights (returned and 8:30 pm), and every other Friday night through Sunday night. Honestly no hostility intended towards you, I do appreciate your input, but what exactly is so fair about my daughter being deprived of this much time with her dad?
What is so fair about reducing your daughter's time with the person who has been her primary caregiver? What is so fair about upsetting your daughter's life and messing up the situation she's in now? What is so fair about putting your daughter into a situation which is almost certain to be fraught with conflict (50:50 when the parents don't agree)?
You have an order. The time to argue for greater responsibility would have been before the order was established. Actually, the best way to get greater responsibility would have been for you to be the primary caregiver in the child's life BEFORE you separated from her mother. Under a scenario like that, fathers can and do get primary custody. OR, if you were important enough in the child's life and you and Mom were able to agree that 50:50 was best, you could have had that.
But the court is not going to want to see you come in after the fact and say "I want more time because of ME, ME, ME". Not going to happen.
Your best bet is to be nice to Mom and take whatever additional time she gives you. If you're cooperative enough, that could be significant. For example, my order says 50:50, but I actually had about 60% of the overnights in 2011 because there were a lot of times that it made sense for daughter to spend extra time here.