Quote - Yep, I'm taking full responsibility for that shin length thing. I actually changed the thigh/shin ratio to what it is now when I noticed that when Antonia's legs were bent at the knees, her shins looked too short. This seems to be a common problem. Due to limitation in the rigging system, actor origins are in practice not always placed at their natural and realistic pivot points, which leads to inconsistencies in the relative proportions of body parts.

You have to remember that Antonia was rigged pre-P8 and with the original intention to make her bend as realistically as possible even without JCMs. If I made a new figure from scratch now, I'd probably do more detailed research on human proportions, try to place actor origins as close as possible to their natural pivots and use P8's advanced rigging system in combination with JCMs to make the mesh behave nicely with those.

It is not a big thing, and it becomes apparent only when Antonia is used side-by-side with a real human of same size in same perspective. It is easily fixed when necessary.
I am not an expert in joint setups. You do a great thing with her, and if this is what can be achieved without P8 facilities, I really wonder what can be the result when these are used to the fullest.