I will definitely log it in my thread if I go that route.
I just finished some autos in a 4x4x4 rockwool cube sog with 3 plants per sq foot. The rockwool just holds so much water that it was hard to not overwater the plants that were a little behind in drinking.
My thought about coco and maybe some perlite is that even when it’s fully saturated it won’t be too wet (assuming the plant has fully rooted the pot). However I’m just not sure 1 liter will be enough since I’m likely going to be running sativa dom hybrids.