Good light is important to setting up a TT. Make sure your TT is level before setting up the cartridge. A good alignment protractor is helpful as is a good digital scale, VPI setup tools, in my opinion, are a rough estimate of a set up. To set azimuth on a VPI arm the arm has to be balanced (set to proper weight) after setting the aluminum rod on the arm or the weight added by the aluminum rod can skew the results. A bubble weight can crush the cartridge. After setting azimuth with the rod it's best to visually check the cantilever for azimuth.
From your OP I think you misunderstand anti-skate:--"Ordinarily, I would have thought the cantilever was pulling slightly inward towards the spindle because of excessive anti-skating force, but as stated above, I am NOT using the anti-skating set-up"-- When antiskate is applied it prevents the arm from being excessively pulled to the spindle. On a VPI TT the external anti-skate rig is probably not recommended but one twist of the tone arm wire might be a good idea.
It takes time, a long time, to get it perfect.
From your OP I think you misunderstand anti-skate:--"Ordinarily, I would have thought the cantilever was pulling slightly inward towards the spindle because of excessive anti-skating force, but as stated above, I am NOT using the anti-skating set-up"-- When antiskate is applied it prevents the arm from being excessively pulled to the spindle. On a VPI TT the external anti-skate rig is probably not recommended but one twist of the tone arm wire might be a good idea.
It takes time, a long time, to get it perfect.