This was such a clear statement of plant needs...that I felt compelled to draw attention to it.
I'm essentially a lazy dude and I discovered this doing small plant sog E&F. I was new to hydro and phed res to 5.4 and allowed it to drift to 6.4 or so. This allowed me to extend res corrections to every other day...rather then daily.
Lo and behold...the plants grew perfectly. No issues...well except for the occasional Mg deficiency (damn White Widows) which I was eventually able to eliminate. So much easier to add a little Mg rather then playing catch-up.
Where was I...Oh, yes: Very good info Michael.
Cheers,
JD