Opus88,
Do you use other sources (CD, SACD, etc), and if so, how do they sound playing classical music? Knowing how the rest of the system sounds would at least help to determine if your issues are isolated to the analogue part of your system.
If the issue IS in the choice of analogue gear, and not a adjustment issue, I think you need to focus on the combination of cartridge and phonostage. A "wrong" combination would be most obviously manifest in handling of upper frequencies. I find that with any given cartridge, a wide range of results can be had with different phonostages and it is not easy to "predict" the outcome based on the reputation of the products.
Thus, at best, I can only offer a rough guess that something like the lower price range Koetsu cartridges might work. Perhaps some non-MC cartridges should also be considered, such as Grado cartridges (somewhat blunted transients).
If you stick with MC cartridges, you might want to look into alternative MC step up transformers (SUT) and to bypass the SUT in the EAR phonostage. I am not personally familiar with your EAR phonostage, but, others have reported that the built in SUT is not as stellar as the active stages. The "wrong" SUT can sound excessively edgy and sibilant. There are MANY different separate SUT on the market and perhaps one would work better than the built-in unit. It is also easier to arrange to audition transformers than it is to audition cartridges.