Dear Axelwahl, dear Feathed, you should check and read (for inspiration...) the thread about "oldskool tonearms...." from last month. During this thread the problem of tonearm geometry was discussed in length. Inner groove distortion is either a problem of:
a) miss-alignment/-adjustment of tonearm (any of its parameters)
b) miss-alignment/-adjustment of cartridge (any of its parameters)
c) worn or damaged stylus
d)...there is no d)
If you hear clear and precisely that the sound is significantly better at the 2 zero-error points, than your set-up is NOT optimal (in fact - far from it).
Please do re-check your whole tonearm-cartridge set-up (for the sake of your record collection....) with a good (Denessen or similar) tonearm alignment tool.
a) miss-alignment/-adjustment of tonearm (any of its parameters)
b) miss-alignment/-adjustment of cartridge (any of its parameters)
c) worn or damaged stylus
d)...there is no d)
If you hear clear and precisely that the sound is significantly better at the 2 zero-error points, than your set-up is NOT optimal (in fact - far from it).
Please do re-check your whole tonearm-cartridge set-up (for the sake of your record collection....) with a good (Denessen or similar) tonearm alignment tool.