The roots that come out of the netpot can stay under water 24/7. They are water roots. It's the rootball or air roots inside the netpot that needs the oxy time. Too much drip. We only drip every 2 hours for 15 minutes. It can go longer between drips.

There is no overwatering in hydro or soil. It is drowning. Think about it raining for 3 days. That's about the limit then the air roots need the oxy or they start to drown.

From your pic's I would cut back on drip and bring up the water level of your rez to about 2 or 3 inches below netpot.

I don't think the canoeing of the leaves like that are overwatered. You should fill out the trouble form and let us really help you find the problem.