Took one gallon water.....and added things one by one

Start ...20ppm
7.6ml pb......570 (this number sounds ok to me!)
3.8 ml CalMag ..780 (i think this is what you are low on....but may be both)

SO....everything else out of the equation.....780 of nutes AINT enough for your rapidly growing kids.....that's my thought.

Then added LK......7.6 ml.....(i didn't think this number sounded too high until I actually put it in the mix) and the number jumped to 1030.

Added 6.5ml Sweet and the number came to 1120. Sound about right?