— How critical is antiskating? How do I set it up correctly?
— Antiskating is a curious thing. Its presence is usually a lot more important than its exact extent.
I would not go into the antiskating theory here. Basically, if the arm has an offset angle, skating force will be present and antiskating should be applied. The offset angle and the stylus drag are the only factors that determine the skating force.
The higher your cartridge's compliance, the more important antiskating becomes. In my personal experience, with the cartridge compliance lower than 5*10E-16 cu, antiskating doesn't really add anything. Between 5 and 10, it's optional. Above 10*10E-16 cu, it's a must.
To test the correctness of your antiskating setting, listen to a real mono LP in headphones. The sound should be exactly in the middle and not "stick" to one of the earcups.
Most quality tonearms have an antiskating scale. Setting it to the mark corresponding to the downforce or slightly higher is a good start. If this gives an acceptable result, you can leave it there.
For a more precise setting, tools are needed. Because the stylus drag is a key factor in creating the skating force, the blank grooveless disc is definitely not the right one to set the antiskating. This is where the test LP comes handy.