I think there has been some deficiencies along the way it is hard to dial in the correct feeding schedule for every strain in the first run. If you grow the same strain next time you can have a better yield. Also you need lots of light to get really big yields, but i do grow with 320 w led and it seems fine and i get what i need, i think you should just let it finish and see if its going to be good or not.
So you understand its not that you are making major mistakes but minor details is keeping your yields down but it is a process, you are new to hydro you are going to learn to dial in the tiniest details with your grows and as i said if you like the “high” this plant gives i would suggest growing it again and keeping a journal and write every feeding (ppms,phs,nute names and mls) and how the plant responds o that feeding, it helps a lot.