Whats up Scrumpy, looked at the info you’ve inputed and what I noticed first was your light distance. Let the plan grow into the light and not the opposite. I’ve done the same. 6” is way to close unless your running CFL or T5s. Your humidity and temps are good. As for the tomato supplements, yeah ok, I guess its better than nothing but if you are comparing to others on here generally we are all using nutrients designed for cannabis so its not quite the same but will still boost your plant. The fact your leave are drooping like that almost seems like they are in desperate needs of watering considerong your soil looked dry in the picture, if I’m mistaken then let that soil dry up and don’t let your roots suffocate/drown if you know what I mean. Move that light and those tops should be stretching this next week. Let me know if you need further assistance, Peace!