Azimuth is adjusted for a level headshell at the factory. The adjustment location is on the lower right side of the pivot location toward the front. It's hidden below the rim of the damping fluid cup. I would not suggest adjusting it unless you are comfortable doing so. The adjustment if very sensitive as well.
If the koetsu is slightly bright, the two parameters I'd check would be VTA and phonostage loading. That is if you are sure VTF is correct, the alignment is right, the cartridge is secure in the headshell, and the damping fluid covers the bottom of the arm.
If the koetsu is slightly bright, the two parameters I'd check would be VTA and phonostage loading. That is if you are sure VTF is correct, the alignment is right, the cartridge is secure in the headshell, and the damping fluid covers the bottom of the arm.