Best tweak I made to all my ML's was to just lightly wedge a 1/2" diameter dowel rod from the back of the top of the speaker to the back wall with blutack on each end (to hold it in place) to make the ESL panel ridged, as it does flap around in the breeze a bit back and forward, did wonders for the imaging/placement and depth visualisation.
Cheers George
Cheers George