I think you'll see a big difference, growing its fun, you can always try some of the bottom ones if it drives you crazy, they will just get better as they mature. And the tops will love it. You must be vigilante, watch for mold here on out, lots of air movement. I think the weight increases almost exponentially as grow proceeds, if you keep the grow factors in the green.
You can knock the flies at this stage, and use the dryer sheets on surface.