Looks like I may have turned a corner! Increasing the watering may have solved the issue, although leaves are still light. First time seeing runoff. Gave PH Down for the first time. I will give more nutes going forward because there may be a phosphorous deficiency. They stopped growing aside from SOG, which would make them shorter than the ILGM White Widows I grew last year.
DG: 14" tall. PPFD 750, DLI 50. This thing is invincible. Frost sticky like glue
SOG: 12" tall. PPFD 750, DLI 50. Pretty yellow but leaves stopped dying. More LST to expose lower green leaves.
MBAPxI&B: 17" tall. PPFD 800, DLI 52. Droopy no more! Getting frosty quickly. Tips of top leaves started browning/curling for a couple days. Cut off all dead leaves.