A digital scale costs around 10-12 dollars. You might want to invest in one. When's the last time that NAD was checked out? From the looks of it, it's a model from the 80s. Is that correct? What is your input chain? Are you using the built-in phono stage or something else?
It is from the '80s. Using the built in phono stage. Again, I have no distortion or sibilance problems with a CD player plugged into the CD/aux input. So could the phono stage need servicing? Perhaps. But it sounds to me more like a tracking/tracing issue, especially given how it mostly fluctuates between records.
I guess you didn't say "audiophile". My bad.
You are probably right that I could be cleaning my records more thoroughly. However, I visited a friend's house who was using a newer AT table with AT cart, and said he didn't know anything about tracking force. He didn't even use more than a dry brush (sometimes). Total novice, yet his system sounded way better than mine. Perfect? No, there was still some distortion/sibilance depending on the record being played. But overall much better. Maybe his '90s (I think?) Onkyo is in better shape than my NAD. His speakers are definitely nicer. Whatever the reason, the overall sound was good enough that I could overlook minor distractions like sibilance. Whereas on my system, it sticks out like a sore thumb. Could my system be slightly more revealing of tracking errors and dirty records? Perhaps. Could it be partly in my own head? Sure.
It sounds like you're basically telling me there are no good options really to improve my system with this TT, though I've read that many have had great success with higher end aftermarket styli and carts. Hoping more people will chime in, so I can get some kind of consensus.