my wife left, but still lives with me #3/continued

[tough spot]

Still no getting my wife past 60/40 custody. She keeps maintaining that the 'kids need a stable school week' (which means her I guess). I responded with the 50/50 schedule of 4,3,3,4 gives us alternating weekends and me always taking them to school on Mon&Tuesday and her always taking the kids to school the rest of the week.

I don't know if her primary concern is the children or not. Let me rephrase that....I think her primary concern is the children but money and inconvenience to her weigh pretty darn high up there...

Any ideas on convincing a spouse to go 50/50 on custody? I really think that that is best for the kids.