I think all of the BRS experiments are pseudo science on which I wouldn't base any decision, esp. to bump alkalinity to 25 (or to 12). Given two controls and two treatments (classic Hurlbert's pseudoreplication) the best you can do is make a line ; it says nothing about variation (and the way they presented the data was surprising to be nice; compare control 1 to treatment 1? smh). I appreciate that BRS is trying to break ground and perform tests on some interesting reefing questions but they don't have the capacity to draw conclusions, maybe some valuable insight, that's it. Further, if you are testing coral growth you want to make sure all the corals are growing; they had some corals that lost weight so what does that say when you compare control vs. treatment? I admit that once I understood what they were doing I ran off to clean the glass on my tank. Regardless, I'm still a fan of BRS the store and enjoy watching BRSTV but just for insight and inspiration.
I shoot for 7-8 dKH.