You'll jack your job in for the school summer holidays
but you won't take a day's leave to reconnect with your partner, or book a babysitter at weekends?
Day off together while the kids are in school/childcare? "NO."
Babysitter at the weekend? "NO"
Take over everything for a fortnight and let her properly recharge? "NO. I'm already doing that because 60% is the same as 100%."
Honestly @MoonbeamsGlittering I'm beginning to wonder if you even want to solve this.
You seem kind of rigid and inflexible about it. And not at all solutions-orientated.
I asked you what you want, and I don't think you answered,
So I have to draw my own conclusions.
It seems to me that you want your wife to sit with you in the evenings after the children go to bed - and nothing but that will do.
You're not even prepared to try anything else.
You're not prepared to work towards it, or come at it from another direction.
Or even look at it from your wife's point of view.
By your information that poor woman works, does chores and childcare and goes to bed. That's no life. Where's her exercise? Where are her friends and family? Where's fun?
This thread is all about you and what you want.
What does she want?