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I know it is hard BUT... For now try to focus on building a credit profile and worry less about the score. Easier said than done but I swear the score will follow.
I just pulled all of my scores and they are also in the low to mid 400's. I kind of freaked out until I read your post. I am filing soon (I was hoping sooner but I didn't realize how long the paperwork would take!). I'm determined to improving my credit (and keeping it that way!) but I am hoping that my scores will jump up a bit after I discharge. Anyways... your post lifted me up a little bit to know that your scores were similiar to mine and you are on the right track