Hi you can see taht you have the right distance to the lamp if you look at the nodes. between the nodes you should have space around 2 cm... if you have under 1 cm or less your lamp is to low. You topped and LST your Girls. thats what slows them down. But for me they are looking right in size( counting the toping) I wont do more at the moment with the plants, and just let them grow for a week and then look how they do, not all strains like topping.... cheers and have fun. 500 ml is a rich amount, but looks right if i look at the temperature. Apropos, watch the temps, at the moment its great, but try to keep them under 28 degree