The first photo is interesting. The plants seem to be so closely spaced that, if in the ground together, they might dwarf one another. Yet with separate grow bags, they seem to be flourishing, despite the close spacing. My guess is that the grow bags are simply eliminating root competition and mutual inhibition. [Or perhaps they are not as closely spaced as it appears.]
Bob
They are packed in there. About 1 ft. apart.
One of the supposed advertised advantages of grow bags is "air pruning". Rather than spiraling around inside a hard pot, the roots are theoretically supposed to penetrate the bag, but die at the surface from the environment. The dying is supposed to encourage new growth without the bags becoming root bound. My problem last year was providing water to fabric bags. The pools seem to have made a huge difference for several different reasons.
A couple other advatages that I am seeing with the taller pool sides compared to an individual saucer type reservoir is that the pool sides block the hot wind and direct sun on black fabric, reducing evaporation even further. Plus, the lower leaves intertwining due to the close spacing completely shields the top of the soil from the sun and hot wind. So far, I only water three or four days apart (at most), rather than daily like last year. I note that after a heavy dew, there is quite a bit of condensation in the pools and the surface of the soil is damp. These are 3 gal. grow bags compared to last years' 1 gal. bags, last years' bags were open to the air and sun, and summer hasn't gotten here yet and this season so far has been more often mostly cloudy rather than mostly sunny. But overall I am extremely pleased with the results so far. 31 plants contained in three 4' circular pools.
I think the two times I pumped the water out was not necessary.
Pool sides and overlapping leaves.
edit: due to the slope of the pool sides, there is an air gap between pool and grow bags.

Holding back a plant for view of interior.

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