There is so much dependent on the music you like and what in music you listen for that determines which cartridge is best for you; therefore, it's not being objective when you blame the cartridge; especially when speaking of a high quality cartridge like the "Grado Sonata" that captures the soul of female vocalists.
Grado cartridges are not conducive to the music preferred on this forum for the most part, that's why they get such a bad rap here. The solution is to find a cartridge conducive to your music.
There are still too many variables to answer your question, but it's for certain that you should audition as many other cartridges as possible.