The big harvest was with 10 plants I think. It was the biggest I think because it was all one strain. All my other grows I ran between 2 and 6 strains. I did 2 big plants once in 2 separate DWC's one time. My first was 6 plants in one DWC. Later I went with flooded tubes using between 5 and 10 plants.
If I ran it again, I would probably go either with two lights stacked, or with a light mover, to get direct light to more of the height. I would have also flipped earlier. Every single grow I always thought why did I veg so long. I ended up needing to cut off so much plant as things progressed because it was so crowded.