Once you have roots popping out the bottom of your netcup (about a week or so after transplanting) most all DWC users will then drop their water level to 2'' below the netcup - let it drain a couple days and then check the solution, assess, and then get it back to 2'' below the netcup again with w/e you needed (plain water / nutes). This is very "heath robinson" and has worked for many growers for a very long time.
You CAN improve upon this - your head is in the right place. I started with the above standard and eventually moved away from it a bit. I let my buckets drain and don't fill all the way back up to 2'' anymore - creating some drought stress and naturally boosting root growth as it drains (plus the pruning stress from your bubblers + a root stim and πππ).
Now doing this does jack up your PPM a little bit, but so long at your below 2k and all is well, your plant will be fine - in a well acclimated hydroponics system the plant can take it!