In a soilless grow with multiple feedings, you should reduce the differences that a pot causes, but maybe not completely.
I bet you see familiar trends, just reduced impact.
Rootball is not only concern.. that's a big rootball, btw. The fibrous threads it sends out are doing most the work. with good irrigation techniques, should be fine hairs throughout substrate and not bunch up near top unless it's simply overgrown a bit for pot... nowehere else to go etc...
Because you are feeding 2x a day, it'll have access to more nutes per 24 hours than a normal small pot would have, otherwise. It can keep up with production of larger plant in this context than otherwise. So, should see a reduced impact. at some point, a larger pot will still allow for more root mass. whether you hit that ceiling given size of current pots and length of time in them, who knows...