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When you have extra cash.. boost the secured line from capital one. Also try for a BoA secured card... try to get that high as well so that when it grauduates, they match your lines and send you your deposit back...
Wait for some of those things to fall off.... send some good will letters... dispute what you feel is inaccurate... other than that... it's just a waiting game..
oh, i'm sorry! I read it wrong. I thought your cap one was secured! Have you thought about a secured card? That way you could make your limit whatever you want it to be?