Wow your pattern is super consistent. This week I've been off and my wife has a mix of home work and in the office so the result in not a sinewave like yours. Weather's been great this week so windows open. You could consider becoming evening showerers.
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I wish mine was like that. I would take 8.20-8.30 all day long!!
It's tough because I have 3 boys and they are all homeschooled by my Wife so I have 4 humans and a dog home the majority of the day. It is difficult to maintain a high pH as it is. Throw a water heater in the mix and it goes down real fast!
Most of the family showers at night so maybe I need to get with the program