Your ex doesn't get out of child support with a 60/40 schedule.
He would be supporting the children when they are with him, paying for food, clothing, transportation, toys, recreation, school expenses, daycare, housing, utilities, everything you would pay for if they were with you full time.
What changes is that he doesn't make cash payments to you and then you spend the money.
Your expenses would go down considerably. There would still be a child support payment from the higher earning parent, I presume him, it would be set-off in a 60/40 arrangement to cover the support when the children are with him.
This decision should not just be made for financial reasons. That goes for him and it goes for you too. If it comes across to the courts that you are resisting just because you want to receive full child support this looks bad. It is better if you both try to avoid this type of argument.
That being said, we all have financial issues. The best thing for the children is to have two parents equally involved with their lives who can co-operate and not fight about money or power. If a 60/40 situation can ease the hurt and the conflict and the resentment and allow you two to call each other up and discuss the kids needs and their lives and what they are doing and enjoy being parents together then it is worth anything.
The best thing for the children is if you two can agree on custody, agree on scheduling and get on with your lives and parent in a loving way that acknowledges that there are two equal parents. This isn't just words, I have lived this and there is plenty of research. The children thrive knowing that they are loved and cared for by both their parents in a situation that is low or especially non-conflict and non-confrontational.
The two of you should be able to act like co-workers in an office, not doing the same thing at the same time, but passing work back and forth and covering for each other on sick days and vacations. You don't have to like each other, you don't have to ever be in the same room, but you have to work in concert and communicate. This is what the children need regardless of what you and your ex feel about each other.
Anything less than this is bad for the children and it would be your responsibility as much as your ex's.
That doesn't mean it has to be 50/50, or 60/40 or any special percentage, it means you co-operate and discuss and don't fight over bullshit like a few hours a week.
I have friends with no separation agreement who have a roughly 50/50 schedule who work together and arrange the time according to their child's needs and who happens to be working on a given night. They have gotten along fine for 5 years now since splitting up. I often look at them as an example I want to follow.
That doesn't mean you have to be exactly like them, but in spirit every thing you do should be to put the children first.
Thinking that it's bad for the children to have a split schedule and it's bad for them to move back and forth is self-serving, to be frank. My children and many thousands and thousands of children thrive just fine going back and forth between parents. What children need is for their parents to stop fightings.
You may have been the primary caregiver up until now but now you are divorced and everyone's life is going to change. There is no reason you absolute must remain the primary caregiver. At one time you had never been a parent at all, then you became one and learned to be a caregiver. There is no reason your ex cannot change his life and become one too.
You will certainly appreciate the time to yourself, the chance to have an independent life and the chance to grow and make something for yourself. Use the time when the kids are away to have a life. I have my kids 50/50 and I have friends and activities and work and school going on.
Stop and make a list of actual factual reason why you should have full custody and then look them over and seriously question why you wrote them. Is it for you or is it for the kids? I seriously dislike and disrespect my ex, but my ex is a good parent and the best thing for the kids is to have us both in their lives equally. I have no doubt about that whatsoever.