Sounds like you've done a lot for it.
I got my first chicks (didn't hatch them) last year and spent a lot of time trying to help a couple out. One lasted about 2 weeks. We also helped out one that made it through a coon attack. The 2 that survived were always behind on development and didn't amount to much. We kept them till late fall, but they still didn't make the table - soup wasn't bad though.
For the amount of time I put into it, and for what I got out of it, and the quality of life the 2 chickens had being at the bottom of the pecking order, I won't be helping out like that again. Just wasn't worth it for any of us.