Okay, so pics are sideways. Humor me, and turn your head. You can see different 90's at different angles. In the middle barrel, you will see that the discharge flow matches the intake flow. This drains the barrel but never releases to allow a complete refill.

If anyone has input, please chime in.
I am running out of days to resolve this. Tomorrow is the last full day I have to get this right. Otherwise it goes to sitting until I have time again.