The speakers are pretty symmetrical relative to the TV/CC. However the MLP is to the right of the CC/TV by 2-3 feet.Looking at those, and being a newbie, IIUC, your left and right mains are interfering at different points with the sub. They are not symmetrical? If that's the case then one delay would not be able to fix the issue.
Not according to wiring or YPAO or any test tones on a BD.Or one of the mains is out of phase?