You had me at Some recordings I hear it, sometimes I don’t
MC's comment above is a little cryptic to me. If you hear it on some recordings and not on others wouldn't that mean it is in the recording? If it was something in your system wouldn't you hear it on nearly all recordings? On the other hand what self respecting recording or mixing engineer would put out a product with such an obvious defect? Maybe it's a stamping defect? I've struggled with this problem for many years and I've recently made some changes that had some impact. I've found that record cleanliness and turntable geometry tweaks have made a difference. Sibilance is not completely gone but is way less irritating than it used to be.