Let’s see the roots. My guess is you’ve damaged your root system by way of your medium(whether it be ph, nutes, etc). That coupled with a topping seems to have stunted you big time.
The strain you are growing is a short indica for starters. Secondly they look hungry, but maybe it's just lockout? Maybe there is enough light for now, but once those get big you want double the wattage you are currently running for a 4x8 space.
