Dear @noromance : I don't like to manipulate that often the cartridge suspension where any " thin " mistake and the suspension could goes out or with out been aware it could be weaked at each time and if we do it so often like you just can be aware of any damage till is " to late ".
In the other side the vry tip of the stylus tip is cleaned by it self tracking grooves if the LP are really clean and this is the first premise in that stylus tip cleans.
Only in the new LP the tip can been dirty but after 2-3 playing times everything goes normal. I'm not saying don't clean the stylus tip only do it not so often as each side.
The developed LP surface static mekes more harm to what we are listen it and we need an anti-static gun or the like to be safe down there because the dust threads comes from that static and this is the true dirt that makes the harm to the sound.
The stylus tip cleans always is a controversial issue and we post what we thing already fuctioned for each one of us.
@richardbrand : " sound quality is incredibly sensitive to tracking force and to dirt on the stylus. "
Usually MM cartridges are high compliance ane if the cartridge suspension and the VTF is centered at the manufacturer VTF range " minute " VTF changes normally we can't listen its differences but in the other side been high compliance cartridges the VTF could makes that the VTA changes more easy that with medium/low compliance cartridges design. It's not easy for me to figure out what you are listening with those VTF changes and if your SME is spot on in its original specs and you not named the classical LPs where you listen those differences.
R.