Hi Beth. I come from the other side of the fence. My husband pays child-support for my wonderful 9 year old stepson. Let me tell you what I know that may help:
You can ask for a review of Child Support only once a year. If your ex doesn't have proof of income (paystubs), FOC should be able to get them from his employer. They should also be able to contact his employer and require that they debit the CS directly from his paycheck, so he has no choice but to pay it. My husband set it up this way by choice so his ex has no cause for complaint. If FOC hasn't done this, call your case worker and ask.
Vistitation and Child Support are seen as two separate things by the court. If he doesn't pay you, you can't withold visitation, and if he doesn't show up for visitation, he can't withold payment. You are entitled to the support regardless of whether he sees your daughter or not.
As soon as the amount he needs to pay is set by FOC, if he doesn't pay the amount adds up. Once he is in arrears by $1500 or more, FOC will take his income tax refund. In some cases, they can even take it directly out of his checking account.
Documentation is your only recourse. Document everything, down to how he treats you. Right now, it may not affect your daughter, but as she grows if he is not respecting you, she will pick up on it. This is destructive to her relationship with both parents, and it is possible that FOC may limit his visitation.
Try to leave emotion out of it. Keep to the FOC guidelines and limit your interaction with him. Refuse to discuss anything in front of your child. We have set up a phone call prior to picking my stepson up and after he goes home to go over any issues. Maybe you could do the same thing? If he is rude to you or tries to manipulate you, simply say you have to go and hang up the phone.
Don't bad mouth her dad (at least in front of her). As she grows, she'll understand more than you think she will, and she'll make up her own mind. My stepson's mother consistently bad-mouths my husband and I, telling him all sorts of lies about us, but we simply correct the lie and do not retaliate. The bottom line is that she is his mom and therefore to be respected. Even if she doesn't earn that respect.
Good luck. It gets better, just try to be patient and roll with the punches!