Very nice work, Dutch!
Regarding auto's, you 420% can go full term under 12/12 and get great meds but the yield will suffer compared to 18/6 or 20/4 (which is what I'd run
IF I ran autos!)
. They grow outdoors all the time with 12 hours, or less, of light per day and, because they're not dependent on light cycles, you can up the lights to 18/6 or 20/4 later and it will only help.
Regarding the article on flushing, it was a great article!
Minimizing deficiencies at any stage, I think, is a good thing!
My personal opinion is that flushing is important when using chemical nutrients and not so much when growing organically in soil. Most of the chemical nute manufacturers show decreasing dosages towards the end of flower, which is really what the article is advocating - a managed reduction in the dose to avoid "shocking" the plants with starvation during the last couple of weeks. That being said, if you're using chemical nutes, you can flush with a clearing solution like Clearex and essentially be flushed in two days instead of two weeks, which isn't much of a shock before harvest. For an organic grow, I don't believe it's needed and I certainly wouldn't want to add Clearex at the end!