Hi Yashu. I tried a variety of cables on Thiel CS 2.3s, using a Krell KAV-250a, also trying to get rid of that dry/grainy/bright sound. Most cables sounded pretty irritating, including my Goertz MI-2s, which had worked well in nearly every other situation. The best sound we got was NBS Mine/Serpent II. Fast, open, detailed, but not bright or grainy. Wish I could have tried the better NBS but I didn't have any at the time. Highwire(I don't know if they are still in business) model 1100 sounded very smooth, soft, sweet, but also closed in, and rolled on the top and bottom ends.
Interconnects were mostly AQ(not the latest stuff). Watch your power cord; the Krell KAV series is very pc sensitive, in my experience. I would also consider the MIT or Transparent matched-system approach; seems like this would be right up their alley.