Shawn,
AAA came to swap my wife's flat with the spare as I was about to post so this got delayed 40 minutes.
Nope, my gray hair ate into my brain cells and I forgot to paste the link I had saved.
I edited my previous post adding the link for better continuity.
The 'scope method is dead on. The azimuth is right when you get the best balance between right and left channels. That is a null when you are inverting and adding. The same thing goes for anti-skating. If the stylus rides one groove more than another, you get the same kind of imbalance. If you have both of them off neither will really zero. Then you have to tweak them down till you get zero on both azimuth and anti-skating.
I like it because it is pragmatic, logical and you can see it working. This is the same method used by the Fosgometer.