Reading Routine Reinvestigated

I've been trying to juggle too many reading projects at once. I was trying to juggle fiction, nonfiction, and a writing nonfiction books. I simply can't do it. Between the OCD and ADD, I'm too afraid to even begin; when I do I bounce amongst them so much that I can't retain anything. Therefore, I have implemented a new plan. I will try to read one book at a time, and try to read it within three days. I've been googling reading speeds and how quickly I should be able to finish a book. If I read 250 words (about 1 page) per minute, then I should be able to get through a 500 page book in about 8 hours. If 1.5 minutes per page, then 12 hours, which is doable. I will read parts of one writing nonfiction book when I need a break from the fiction.

Most of the fiction I will be reading will be science fiction or techno-thriller from which I may be able to get techniques and ideas for my current WIP.

As Thomas Edison said:

"I have not failed. I've just found 10,000 ways that won't work."

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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?