I would also model the OB in the EDGE program to see what more offset would offer as far as flattened response.
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Did that and got pretty good results - myself and a friend once made baffles of the same size, but with different driver positions. Mine was close to the side, while his was close to the top. Both ours were very offset - far from the center, and both sounded smooth.
Wide range OB design is full of dilemmas. Size, flatness of response, bass extension, directivity... It's almost impossible to harmonize them. You have to have priorities sorted first.
The original design of that in the 1st post, IIRC, is for fullrage (even without EQ?). That is a pretty big (wide) baffle, and with the very low position of driver. These factors, I believe, are aiming for compensating bass. However, I can imagine it's overall performace in midrage purity, natural sound stage and imaging won't be very good...
From the most picky view of OB obsession, the side wings might cause some resonances (plus the equal distance both side). Also, the driver is already very close to the largest 'wing' - the floor. Early and severe reflections are inevitable.
Tradeoffs, tradeoffs....
I think, re-target the bass response one octave higher (about 160Hz), and add some 'tolerance' to EQ, then the possibilities will open up immediately, and vastly. And overall it might bring many other benefits, too.