You changed the cables and might have a capacitance issue. MM cartridges are very sensitive to capacitance and the wrong capacitive loading will change the high frequency balance. You have three variables you can play around with, the cartridge, the resistance load and the capacitance load. You can "tune" your high frequency response this way.
I always shoot for the lowest capacitance in cables and usually play around with resistors first. Your load now is probably 47K ohms. Read this article https://www.tnt-audio.com/sorgenti/load_the_magnets_e.html
A word of caution. When people note a bright sound this usually means a peak between 6 kHz and 12 kHz. Most people will not hear a peak at 20 kHz. Even a peak at 16 kHz might not be perceived as "too bright" but rather as more detail which some people like. It gives you that surrealistic Hi Fi sound.
I always shoot for the lowest capacitance in cables and usually play around with resistors first. Your load now is probably 47K ohms. Read this article https://www.tnt-audio.com/sorgenti/load_the_magnets_e.html
A word of caution. When people note a bright sound this usually means a peak between 6 kHz and 12 kHz. Most people will not hear a peak at 20 kHz. Even a peak at 16 kHz might not be perceived as "too bright" but rather as more detail which some people like. It gives you that surrealistic Hi Fi sound.