You are rigth, not a problem in your system because you have a system ( with all respect. ) where you just can't be aware of those problems: that system has non-adequated resolution or to high on everykind distortions to be aware of it.
The other situation with you ( with all respect. ) is that you do not know what to look for because you can't detect those kind of tonearm distortions because you still are not trained to do it and that's all.
I can be wrong in that FR subject but it does not matters what you think or say: J.Carr is rigth he knows a lot of audio things that you even can't imagine and because of his ignorance level knows what he was and is talking about when you just have no idea and your answers confirm it.
You are not open mind when @dcbingaman gave you the advise to try that after market damping.
Your attitude always is the same, you never say: " ok, I will try ". What do you have to lose if test it? Tests of everykind is part of each one of us audio learning to really grow up ! ! ! ! !
Regards and enjoy the MUSIC,
R.

