640 is the minimum threshold in my shop, I doubt the amount of debt is pushing your scores down, I have seen credit reports with crazy amounts of debt, one example the monthly payments equaled the applicantâ€™s gross income, yet she had a very high credit score.
It isnâ€™t the amount of debt, but how you manage it that bashes the score. Most of the people I help make the mistake of focusing on one or two â€œlight issuesâ€ and ignore the elephant sitting on their chest. Having said that, high balances on credit cards will lower scores and they are accumulative, with the first that goes above the magic line doing the most damage. Start with the small limit high balance cards and pay them down first, below 25% of the limit on the account, keep it open but the balance very low. Work you way up from the smallest to the largest because you get as many points tweaking a small account as you do a large one and it takes a lot less money to do a little one.
The info about credit repair I linked belwo may keep you from harm. Good luck,