OP, with such programme material, you might enjoy addition of air, separation, and greater front to back spatial rendering, trying Max Townshend's Supertweeters. Designed specifically for ESL57's. Listening to the kind of music you note, even, at low volume in the evening resulted for me in a magical bath of sound. (Electrostatic Solutions rebuild at 89dB efficiency and 4W + 4W ADI valved SET, (15' x 13' x 10' ceiling room)). The SET was part of the magic. Alas by comparison my rebuilt Quad 303 was dry with markedly reduced colour. If you go the SET route, check with amp and valve / tube manufacturer on long term operating conditions. Alas, I had no space for my 57's, and so they went to a very happy fellow listener.
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