Thank you for your question.
This is purely my opinion based on experience with family law
judges - most would prefer that parties try to resolve issues among themselves instead of trying to immediately run to court anytime something happens, especially where the issues are minor. I've actually had a judge say that to the parties on the record in a case, in fact.
That said, if your ex failed to do these things, then they are still in violation of the agreement and your remedy remains the right to file contempt charges. However, if these are the types of violations, I would not expect a judge to award you more custody as a result. For a first time contempt action, the judge will probably give him a serious tongue lashing, probably make him pay your attorney fees for having to bring the motion, and maybe (and that's a big maybe) fine him. That's it.
If these were serious infractions - he was refusing to return your minor child(ren) to you, for example - then I think you would have a stronger argument for more custody, but something like not maintaining a land-line or not transferring assets timely won't get you there.