a few suggestions: switch over the the flowering nutes if you haven't already. they carry less nitrogen which should slow down vertical growth. i know i said you COULD wait but it's for the best. also id do about 3/4 strength. if they show signs of underfert then go ahead to full dose.

i did some research on blue vs red lighting, apparently to my forgetfullness, blue encourages foilage growth while red encourages stretching and fruitation.

so, you might think about taking a few lights out and cutting off the CO2 to slow them down. When you do get buds and after a few weeks they begin to thicken up then you should go ahead and reapply the CO2. Id also spend a few extra bucks and swap out a majority of your lights for the 2700K soft whites at that time. Way better red color for growing bigger buds.