The outer groove is the right channel. If the anti-skating is being not so effective, the stylus will be giving the left wall a snuggie and the right wall will be like a skipping stone on the water (in a worse case). In some cases, I've seen the stylus come out of the groove all together and do a nice scratch.
adding more anti-skating will relieve the pressure on the inner groove and allow the outer groove to track as was intended.
If an arm were to have zero anti-skating (not including an AR or VPI arm) and you used a blank disc, the arm would race to the spindle. You could say that the stylus and it's offset angle act like a boat rudder and steer the assembly inward. Logic would make you think that the natural direction would be to go to the outside, as if you were to put a penny on the record and start it up, the penny would go flying off, outwardly.
Anti-skating is accomplished in several different ways. One technique is to use a spring to apply an opposing pressure to neutralize the skating. Another design uses 2 attracting magnets, the adjustment brings them (and their sticking power) closer together. Some arms have a drop weight that can be seen externally, looking like a fishing rod with a weight on the end.
To that end, the little dial on any turntable is simply a reference. your eyes and ears should be the final judge on how much anti-skating needs to be applied. Sometimes a visual indicator might be the stylus assembly appearing to be pulled to one side, tho this is sometimes not so easy to tell.
I know every TTs owners manual says to set the dial of the anti-skate to match how much VTF you have applied, but that is a very vague general rule, it gets you to a starting point, it is not the final word on this adjustment.
When things are all dialed in correctly, your table will let you know. Things will be very open, reverberant and captivating. Of course it helps to start with a good recording, and an LP played many times with the anti-skate improperly set may have created permanent damage to the LP.
One more thought is that a great playback system isn't necessarily one that makes all the LPs sound "pretty". If you have a crappy record, it should sound, well, crappy. If you have a great recording, you should have bliss. The object is to have a collection full of bliss.
Wayner