It would be helpful to have a full or budget to understand where your funds are going because from the description you should have plenty to take care of all of the extras you’re talking about. It does sound like you’re saving an excess for retirement, so that is a place you could cut back. Also childcare cost will likely go down once the kids are in school full-time and with the flexibility you have at your job would you be able to pick them up and have them at home until you’re off work?

With your ability to do overtime you could also target bringing home an extra $1,000 - $1,500 a month for savings and 529s.

But I agree with others it doesn’t sound worth it to leave your job now but maybe in a few years.