I’m still a few pages behind so not sure if you and bill figured this out but I know a former member (he passed away) but he used only earthbox juniors for everything and he did 1 run of 4 plants with 2 boxes with air stones down in the reservoir and other 2 without and he either said was no difference or the non sir stone ones did better! It’s like I’ve said tho earthbox being long rectangles means that as the roots grow thru bottom deck they have a nice long canal of open airspace to get plenty of oxygen so no need for any extra! Them SIP buckets however don’t have near the reservoir plus all it’s space is vertical so only time they get oxygen to the roots is when water level drops but it’s not near as much space as an earthbox jr even! If I remember correctly them SIP buckets don’t hold that much water and it’s the airspace created in reservoir when water drops that allows roots to get that fresh o2 so smaller the reservoir the less they’ll get!
So in summation it may be somewhat beneficial in them buckets but I’ve never used 1 to know! I’ve had great results with every earthbox plant as long as I kept enough food for them so I’d go that route over buying air domes to go with the bucket style! If u already have the buckets and the domes then couldn’t hurt to try!