So after using half strength nutrients for a week she started to cannibalise her lower leaves, taking nutrients from them and sending to upper growth where required. In view of that, I started giving full dose again and reduced DLI to 35.
Light: 68% @ 37cm @ 18/6h approx 35DLI
@nonick123, approx 40, which I suspect is too much! Iβm thinking 35 is the sweet spot but Iβm only using Photone with a piece of paper so probably not the most accurate