Looking amazing, I have done DWC for a long time and your are doing a bang up job. I need to go back and look but how much air are you pumping into your bucket? The reason I ask is because you have a lot of the variables down pat especially with that amount of GN LED power going on in there I think you could probably double your air output(if possible) and I think you would be amazed at what it does for the overall growth of the plant especially in the final portions of flowering when the rootzone is essentially connected straight to the flowering part of the plant.
I was told a long time ago that Cannabis plants love almost above all else air to the roots. I have experimented with this environmental variable the most of all of them I think over the time I have been doing DWC and I can say without a doubt that the person that told me that was right. You can check out my AutoXtreme grow in my sig and kind of see what I am talking about. It is what I call the max o2 theory or somethin like that lol, basically when all other environmental variables are optimal i.e. lights, temp, nutes etc that in a DWC system you literally cannot have too much air to the roots she will literally take all that you can give her and love you for it.
At any rate you are doing an amazing job and I can't wait to see the final results. Happy grow Karma comin your way!