Growing RQS

Plants started out early really good but havent grown much the last weeks. Probably due to overwatering as it is my first grow and I was kinda over-doing it. Lights are running on 75 percent of the maximum 800 µmol/s. I would be happy if you guys got any tipps for me ! I am thinking about going into 12/12 soon but my plan was to get the plants a bit bigger and then start switching the lights. Also I have started LST pretty late like week 6 or 7 but the stem was pretty flexible and nothing broke so I hope it was the right decision. Also maybe topping was too late? Also thought about scrogging but as my plants are pretty small I have not started yet. Leave a comment if you see need for improvement.