DAY 42
For the most part, things going well. They're growing like...well, weeds. 26-29" on the un-molested, and even 16" on the LST girls. I stuck with the LST from weeks 2-4, then just let them go their own way. I'm raising the light an inch each day to keep ahead of them.
Poor picture

I am still managing to create some problems for myself. As they've been stretching, I've been pushing stronger nutes. I think I found the limit. Only one of the NLBB got 'the claw'. This was the result from a feed 4 days ago.

Fortunately I know what to do to keep this from getting worse.
The two Criticals have a more serious problem. That poor soil mix I did at the start is still reminding me of its existence. I have a soil pH issue, and now magnesium deficiency, I believe.

These are the worst leaves off both plants, and mostly came from the bottom and middle where they lived in the shade from above, but I am noticing fading in some upper growth that I'm sure are a cry for help.
I ran out to the box store and picked up an analog soil pH tester to get an idea what I was up against.
The healthy plants showed a soil pH of aprox. 6.7, the sicker ones were both about 6.2. My water in is at 6.8.
I upped the Cal-Mag over the last few weeks from 1/4 to 1 tsp/gal, and I use it almost every water...Hmm, typing it out makes it feel like not such a great idea, as when it was just in my head. I've read too much can be just as bad...
I haven't started any bloom nutes yet, but thinking it'll be time soon.
So I'm hoping for some opinions.
Please, what have I done, and how can I fix it?
Hoping to get a grip on this, before I do any real damage.