I have been getting inconsistent results with focusing on the face using a Fujifilm X-T10 set to eye-detection focus. When the face takes quite a large area of the photo (like for a head and shoulder portrait) this seems to give me very reliable focus even when the subject is moving around. When I move back like for a thee-quarters or full-body portrait of the person siting down it almost always focuses on the texture of the fabric of the clothes.
This is very annoying as the photo looks really good and sharp on location in camera but "soft" (with very good clothing texture) when viewing the photo on anything bigger. It is especially bad when shooting profile, in lower light, and when the subject is moving but it has also happened other times ex. with a completely still subject with closed eyes. Is there any way or technique I can use to get consistent face sharpness?
I usually shoot with the Fujifilm 35 mm f2 at f2.8-f4 for these kinds of portraits.