Northern lights x big bud

Good week she is stacking pretty well now. Enjoy watching her grow. Worried about nitrogen toxicity I have backed right off on the duel fuel watering them with half dose or less every second or so mix that I brew. I've also noticed that my new leafs are growing quite thin and still seem to have dark green tips so I've also cut back to half strength for my bloom nutrients to see what happens any tips from the pics provided would be wonderful