They are still going to stretch as with hid. So account for that, usually with any leds, you keep it on low for veg, and either slowly adjust the power up or smack it all on at once when you flip. I prefer the fast and hard approach. But on second glance, the tops do look a bit stressed. I'd pull up back. I keep my cobs anywhere from 24-42 inches away from my tops in veg and just let the plants grow and fill into them. I prefer lst and topping to achieve as many tops as possible, opposed to Christmas tree style plants (1 main cola, bunch of side nuggets). How far away from the plant are the lights?