I was thinking about your note this morning, and I agree that leaving room for a slower start usually makes the whole day feel easier.
If everything gets packed too tightly, I end up rushing between small tasks and forgetting the one thing that mattered most.
I have started writing down just three priorities, and that has helped more than any elaborate system I tried before.
It also keeps me from treating every tiny errand like an emergency.
If you want, I can send the simple checklist I made, because it is really nothing formal and only takes a minute to skim.
I do better when I can see the shape of the day at a glance.
Also, I think taking a short walk halfway through the afternoon resets my focus more than a second cup of tea ever does.

I meant to answer you sooner, because I had a clear thought right away after reading your message.
I think the plan sounds solid, especially the part where you give yourself a little room to change course without treating it like a setback.
That approach always seems to lead to better results than forcing everything to stay exact from the start.
I usually learn more when I let the process be a bit flexible.
For me, the toughest moment is the middle, when the first enthusiasm wears off and the finish still feels far away.
That is usually when I need a quick reset, a snack, and maybe ten quiet minutes without any notifications.
If it helps, I can look over the draft tonight and tell you where it feels clear and where it feels crowded.
Sometimes a second pair of eyes is enough to make the next step obvious.