I'm going to repost my answer to the other question you posted, as it applies here too:
I hate to break the bad news, but you've already made two gigantic mistakes.
Divorce, especially with children, is NEVER a pro se project. You should have seen a lawyer long ago, and certainly before signing anything. As if that wasn't bad news enough, apparently you signed without doing any research into what's involved in a divorce and custody (if you were going to be your own lawyer, that was essential, and let me stress it's still not good, even with research, to be your own lawyer).
To answer one of your specific questions, even with joint custody, most judges insist that there be a final decisionmaker (the tiebreaker) so that disputes do not all land back in court.
No one here has seen what you signed, but it sounds like you may have agreed to some things (and you may not have, and the fact you don't know that is alarming).
How can you change some things? On your own, your chances are likely near zero. With a lawyer, you have, since there has yet to be a hearing, some possibility of addressing concerns. Monday morning, cancel whatever other plans you have, and make an appointment with a lawyer. The closer you get to the hearing date, the less a lawyer can do for you.
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There really is not enough information in your question to provide a complete answer. It sounds like there could be a mistake or omission in the visitation schedule. You also do not say whether this is a proposed agreement or final agreement/parenting plan.
I strongly recommend that you sit down with an experienced custody attorney to provide you with the assistance that you need. I strongly agree with the other answer that a divorce with custody issues is not something that you should try to do yourself, without the assistance of an attorney.
Remember that any mistake or omission in your final divorce papers will impact your role in your children's lives until they are 18.
Nothing contained herein shall be considered or construed as creating an attorney client relationship between the party asking the question and the attorney. All legal problems are different. The answer given is only a general response based upon the facts provided and should not be considered specific advice for your case. Always contact a lawyer for advice about your particular circumstances and issues. For additional information, you may wish to view our firm website at www.pbcl-law.com. Our firm can assist with custody, child support, divorce, contempt, separation, and other family law matters in Cobb, Fulton, Dekalb, Forsyth, Paulding, Douglas, Bartow, Cherokee, Gwinnett, and other counties in the Atlanta Metro area.