Hello,
Im guessing the beckett tube is pressurizing because of the design of the bends in the bottom of the box.
I didnt see that in the skimmer previously, It is keeping all the bubbles on the wrong side.
I bet if you removed the two 90 elbows and let the water inject into the box, you would get all the bubbles you need.
P.S.....your scarin me with that duct tape.
Marc.