I have had the same chronic issue, also with a Grado cartridge (Statement Reference), which did not occur with cd. I have wondered whether the Grado was off or just more sensitive than other cartridges. It was improved by readjusting azimuth, and to a lesser extent, anti-skate. Hoping that buying and using a test record can fine-tune setup and complete the solution. Mine was also noticeably affected by the tubes in the phono stage. My next preamp will definitely have a balance control.
