I don't listen only to classical but I think I prefer my Stratus to stay on the neutral/transparent side more than on the lush/warm side. From what I read and heard , the Stratus is already on the warm side I think I don't want to add even more warmth.
Your post helped me to do my choice and I'll buy a full set of EML for my Stratus and I'll see if that's ok for me and compare to my NOS visseaux/miniwatt 2A3. if none of these 2A3 do the trick then I'll try the Shuguang 2A3CT.
The Stratus is quite neutral for an SET amp. Changing tubes, headphones, coupling caps will alter this in a direction you like (or dislike). I switched coupling caps to get the sound I wanted.