There's a great thread here about how to build credit to 700 after bankruptcy, but I cannot remember the title to save my life. It has amazing info in there for how to do it right. Maybe someone can chime in with a link.
Are the scores listed in your signature FICO or FAKO? Where do you obtain your scores from? Seeing that you have had this card for 8 months, I would suggest you apply for Barclay's.