Classical speakers that do violins well??

Spica TC50 or Angelus are very good at reproducing the tonality of strings without harshness, are not bloated at all in the bass (the Angeluses seem to have a bit of a dip in the mid bass, but strong low bass). They do have their weaknesses, though, in terms of high frequency extension, dynamics, resolution, and ability to play loudly. (Perhaps this is a speaker that even MrTennis could like?) Plus, they are very inexpensive. Also consider the Audio Physic Virgo II. I've never owned a pair, but remember them in the showroom as one fo the best all around speakers I have ever heard. I liked the Magnepan 1.6 QRs, but could not get them to work well in my room. I also listened to the next model up in the Magnepan line, and thought its tweeter wa way too revealing - every cymbal strike sounded like somoeone throwing a fistful of gravel at the cymbal. More shimmer than you hear in real life.

Check out the Tonian Acoustic loudspeaker
The fostex driver makes instruments sound so natural

Bass is pretty good as well for a small monitor

The most revealing speaker I've owned that doesn't hurt my ears is the Revel M-20. Not sure it's bass is adequate for full tilt orchestra. You might look into the larger Performa series speakers that use similar drivers with additional woofers.

Hesson11, although I firmly believe your problem is largely in electronics or sources, I would strongly recommend the Reference 3A Grand Veenas. They are quite accurate in the top end thanks to the Murata supertweeters. If they sound shrill, it is something upstream that is the problem.

Spendor SP 1/2E. You should be able to get a good condition used pair for 2K.

Pro: they produce very accurate tone and frequency response. They are well and rightly recognized for this quality - a classic loudspeaker.

Con: they don't have very good bass or excellent dynamics. One famous review rightly described them as being "polite".