Do you have an attorney who is really tied in with your
local magistrates and judges? Is your attorney a "pit bull"
when working on your behalf? Does your attorney know
your ex's attorney and have worked with her? I've learned
in my year and a half custody battle against my mean
spririted ex (who also accused me of being a bad Mother)
that my "good ole boy" plugged in attorney helped me
tremendously.
Best of luck! He doesn't really want the children, he just wants to win.