I had a Premier 14/12 combination (since replaced the 12s with SET mnoblocks) with Proac Response 3s. I think you'd like the Proacs a lot.
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I used to run an 11A with original Sonus Faber Grand Pianos and the sound was excellent, warm, richly textured, and great detail. As an added bonus my better half loved these speakers, a first, saying they were sleek and elegant looking. So of course I have to go to something much bigger just to piss her off. ;-)
I remember hearing the CJ11a with Proac 2s. Very musical.
A few years later I finally bought the 11a and paired it with Martin Logans Aerius. Bass was a little soft but the pair worked well. Stats and tubes mix.
The last speaker I had with the CJ was the Thiel 1.5. If I ever go back to a CJ amp, I will definately consider another pair of Thiel 1.5 or new 1.6.
I have run Response 2.5s with an 11a and it is a fine combination. The 11a is also terrific with the Thiel CS 1.6, but not with the 2.4.
Before getting new speakers, though, see how well your current system performs in the larger room. Sounds like the current combination is giving you plenty of magic, and you'd hate to throw the baby out with the bathwater. I don't know the 1SC; it's possible that it does some things you like much better than the 2.5 would.