Drip with 4x4x4 Grodan blocks in flower

Hello all, I flipped fo flower on 3/15 and for the second time, two of my girls are wilted going into night time (20-30 min after feeding time, they perk back up). I’m using 4x4x4 grodan blocks and dripping about 90ml per plant every hour starting 2 hours after lights on and ending 4 hours prior to lights off (per grodan recommendations). This is more water than They we’re taking quite a bit less than this in veg (which I expected) but... What am I doing wrong??? Any Input appreciated.