Everyone I know uses pH at times to isolate nute uptake. That aint theory that is common practice. Usually it is for calcium Def. And you are letting it go up to 6.4 or even higher but then you gotta dump and start over.
I don't know if I ever pointed you at closet cases journal but if you look for it or want me to show you I explain in there a lot of stuff about how to get a stable res that you can walk away from. Also how the best way to manage pH is via PPM not adding UP and DOWN.
I can retype it all here if you want but I am doing 12 hour days at work right now and I am very tired. It would have to wait for the weekend for me to explain DWC res stability and pH cycling (that's what its called by the way...your "theory").
ah heck just in case...
https://www.420magazine.com/communi...-hps-wonder-woman-grow-journal-2015-a.261344/
But a good grower understands the difference between Veg which preferably runs closer to 6.2 and bloom which runs closer to 5.8-5.6 for exactly those reasons.
Below is an enviro chart from the premier best Hydro product on the market. this is how they say to run the system. They know what they are talking about. Look at the optimal pH throughout the grow. And do some research outside here. You will find Lettuce grows best at 6.2...coincidence? I think not. It has nothing to do with the plant. It is about mobility of the nute in solution.
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