I could be wrong, but I don't think real shins swing. I think that when we see a real shin "swing", this is actually due to the thigh twisting. However I think you will find that Antonia reacts much better if you replace the shin swing with some thigh twist. If thigh rotation fixes the problem, I don't see much need to change the shin JPs.

I actually like to use about 1.8° inward swing on Antonia's shins as a default. They look a bit splayed out at zero rotation to my eyes, but that is probably just personal taste.