When the plants get big they drink more than a gallon a day in the 5 gallon buckets, at least in Buds' grow. You could set up an external reservoir, or build larger reservoirs in something like a storage container like Emilya and ResDog did. But either way, you're able to push more water at them than normal which generally means bigger plants and bigger harvests.
If there are pebbles or some connecting media between the soil and the water, the roots will almost certainly populate that area.
I hear that. A true tinkered at heart.
Have you thought about trying some aloe or yucca mixed in?
Hmmm. I remember a post where you laid our the FWFW. In it you stated that when you got to watering twice a day you did both as feed or both as water. Or at least recommended that would be the way to do it. Maybe that suggestion was for a different nute line than you use?
Since you'll have a large external reservoir, why not set it low, like an inch or so? Other than affecting the moisture gradient, as long as there is
some water in the reservoir the plant has all it needs. Then it would also have max air available although I assume that, beyond a certain gap amount, more isn't necessarily better.
Why not just keep it at a very low level constantly? With a large external reservoir, I don't see much need to have a high level of water in the SIP reservoir itself.
Geoflora grows would only be fed every two weeks and
lightly watered from the top for maybe a day or two to activate the nutes, but the rest of the time watered through the res.
@Emilya Green feeds this way but she can weigh in with how it works for her (pretty well based on her photos).
And I regularly mist my mulch layer to keep it moist and keep the top feeder roots working.