Reading Routine Redux

Once upon a time, I had a certain plan in place to help me get through some of my books and to read widely.
I never implemented that plan and instead, my ADD and OCD get in the way, and I can't focus enough to start anything at times.

I am now reinstating that plan which is... to alternate reading 3 books at a time. One can be a nonfiction book about writing, one fiction novel (usually similar to my writing which is scifi), and one general nonfiction book. The non-writing nonfiction I have in mind is about Eastern religions or philosophy.

The only time I can stray from this is if I need to read books for research on my WIP.

Here are my 3 books I'm working on now:

Writing - How to be a Writer by Barbara Baig
Nonfiction - Man's Search for Meaning by Viktor E Frankl
Fiction - Fools' Experiments by Edward M Lerner

Do you have some kind reading guideline similar to this? What do you think about this approach?