No proof either, but made the same experience asI believe the reason why my DIRAC imaging problems is due to my non symmetrical room. I have no technical proof.
My guess is that anything asymmetrical, the room or the listening positions messes the equalization up.It's super important to have the mike positions symmetrical with respect to the listening position. I found that out the hard way.
This might equally explain that the more focussed DL measurements sound "better".
Try to keep your measurement points halfway symmetrical around the MLP, so that you have an about same average response above Schrodinger (~300Hz).
Or limit correction to below Schroder, or not fully correct to average slope.
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