Looking super healthy.
No bucket changes in DWC I think makes us pay more attention to the plants requirements and go lighter on the nutrients. I just cleaned those buckets last weekend and they had solid salts In The bottom of the bucket but plants we’re very healthy. I tend to think of DWC like any other medium. Should only need a flush or complete change if we are doing something wrong. I think if we know our nutrients and watch the leave color it can be a fairly simple feeding process. I just watch the green and adjust from there. If you can keep that light green new growth look into flower and then transition to a low nitrogen bloom period the plants will nicely progress to a deep green by final flower.
Ramble over. Plants looking like they will reward you for the effort.
FB