Rotarius, I keep thinking about this post and some of the insightful responses. I've got a few additional thoughts. First of all, let me say that I've gone to quite a few live performances over the last 20 years. I've heard some live performances that sound like bad recordings, so not all string playing is inherently sweet and smooth. Having said that, a year ago, I would have agreed that most CD's are poorly recorded, especially with regard to the strident strings you are hearing. Now, like Newbee, I don't agree at all. In fact, I find that really bad classical recordings are the exception. I also have found that having a few good sounding CD's doesn't mean your system is OK. In fact, during the slow upgrade process I've done over the last 9 months, I've had some treasured recordings go from lovely, to not so good, and then back to wonderful. What I have noticed is that each change I made has produced a noticeable improvement and reduced listening fatigue. I suspect that a few of the changes revealed other flaws in the system, which then required remediation. ItÂ’s a slow process, since with new cables,IC's, and electronics you need to wait out the burn in before you know what you have. No single change would have been sufficient to produce the desired result, and I'm not done yet. A year ago, it was pretty typical to limit listening to 20-30 minutes, which is clearly not acceptable. Now I can spend 3-4 hours listening and regret having to stop. It's taken some patience and time, but the result has been well worth the effort. In chronological order, I replaced my power amp (Adcom to McCormack), treated the room (Auralex), bought a decent power cord (PS Audio Statement) for the amp, bought new cables and IC's (Signal Silver) and added the AM DAC. All in all, this added up to a paltry $1500 net investment. By far, the biggest bang for the buck was $90 for room treatments. Next was the DAC, but everything I did was necessary. The Signal Silvers cables and IC's really reduced the grain and helped smooth out the strings, while adding weight to the low end. The McCormack is 4 times the amp the adcom was ($250 net!), but I didn't fully appreciate what the McCormack could do until the other changes were in place. Synergy is important, and it all has to work together.
Try the Telarc recording of the Brahms 4 by Macerras and the SCO. If the prominent viola playing in the 2nd movement is not the sweetest thing you ever heard, I promise you its not the recording. (The whole 4 symphony set is worth having, not perfect recordings, but still very good and worthwhile) Also, try the Barshai Shostakovich cycle on Brilliant. This is a recent purchase for me and I'm still working my way through it, but I'm impressed with what I've heard so far.
The bottom line is this. My guess is you need to do some experimenting with the room and equipment. You probably have multiple problems that are reinforcing each other. I'd suggest you work until you identify what's offending, and then see if you still want to go the TT route.
Cheers!