I had a similar situtation in a previous home. I built two wooden panels that were placed behind the speakers so that the reflection was shorter than the distance I had to have, due to other restrictions from the rear wall. I also made the panels able to be tilted slightly and found that tilting them up a bit gave the best soundstage. The wood panels were about the same size as the electrostatic panel. The whole set-up was aesthetically very ugly--which may not work for you--but it did bring the vocals back into focus.
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