Interesting... I keep my humidity at 38-48% to compensate for the heat.

I do fluctuate my PH within range but have never tried a controlled swing. I'll definitely check out your book.

As far as an ideal environment goes, cannabis grows all over the world and has many ideal environments which vary greatly. Plants can also adapt to environmental conditions, from one generation to the next especially. If your plants show no deficiencies I'd say you are providing a suitable environment! Can you always improve? Hell yeah, that's what convos like this are for! One of my favorite aspects of the cannabis community is the willingness to share information worth it's weight in gold.

That's the thing with cannabis, do what works for you! There are so many variables in any given grow that you can not say one grow method is law. Also, these are plants! They just want to grow and be healthy so if you can give them most of what they need they will do just that.