What next?

On your larger plants, you should be able to remove the big fan leaves..leaving the top 3 always but below those you can open it up.. this will slow down transpiration and consequently shorten the nodes up..ideally you do it daily, taking only a few leaves at a time..look for touching leaves that are leaving wet spots on others..this is a vector location for pathogens..one of the two gotta go..aside from that, keep your taller ones on the perimeter and shorties in the middle, as most lights have a higher PAR in center and can reach down to them effectively enough.. Hope this helps