Pretty much impossible to overwater a waterfarm mine run 24/7 no problem. Sometimes the holes get clogged with roots but your plants don't look big enough for that. Your plant looks happy in the picture maybe your weird drip schedule has caused the roots to migrate to the bottom of the bucket where it is wetter so when you turn on the drip rings it drowns them out a bit. Try runnin your drip for longer and longer intervals until the plant does not wilt anymore. No reason not to run the drip rings 24/7 it makes it a lot easier to deal with.