Good week for these, they continue to grow and fill out.
I finally did a bunch of maintenance on the setup I had been procrastinating on including installing the pH doser. I decided to try lowering the pH from 6.0 to 5.8 and the plants seem to be responding well to it so far.
Not sure what to do with the runt - looks like it's going to grow, but not keep up with the others. I might leave it on the veg shelf so it has plenty of light to itself.