ILGMs Jack Herer Auto/2nd grow

Pot size was changed early this week as lower seedling leaves were curling, getting brown, spotted and brittle, indicating overwatering. Despite not overwatering, maybe root rot? Decided to inspect and sure enough, root ball was bound at bottom of Solo Cup and transplanted into 1gal plastic pot with a little more soil and coco vs perlite to hold more moisture. Have been watering daily since transplant and using slighly strong mix of Alaska's Fish Fertilizer for a strong boost of Nitrogen(5-1-1). Will be defoiliating a bit once lateral branches have made some more growth. I also noticed this exact leaf problem with my last Jack Herer DWC grow and am starting to think it's possibly a genetic issue. It seems like a magnesium/iron deficiency but really isn't as proper fertilizers are used and in correct portions. This plant is behind by half as this plant is a month old and quite literally half the size of my last JH grow. I am willing to say 50% is my fault and the other half IGLMs for having a fairly unstable genetics line. I'm just keeping my ducks in a row for these next several weeks as growth tripled preflower week...that could be this plants time to shine and grow to the 3ft mark!