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Comments
I'm new to the forum but let me butt in.
As far as I'm aware it's currently not possible to mirror deformers.
When modeling the face I don't use any deformers at all for the x-axis, but move the polygons by hand. This gives you really nice control on how everything looks including the outline. I then take a screenshot of the polygons, mirror that screenshot and use that as a reference to mirror the polygons.
When not using deformers, I sometimes just move the polygons by hand for the y-axis, too.
Here's how my approach would look if I'd model Haru: