Ripe for custody battle win?

I never meant to go for full custody of my boys but here I am contemplating it for these reasons:
1…she has started to physically abuse the kids.
I have medical records and the kids state as much as well
as the teachers state what the kids say.

2…she keeps violating the 50-b I have against her.
3…the kids are not being cared for as I like them to be, neglected.
4…she does not let me speak to the kids via phone. She doesn’t return
my calls.

What are my chances of winning custody?