The only data available for FICO scoring is the amount reported to the credit bureaus by your credit card companies. If you have a $10K CL card, and a balance of $9K reports every month, this is interpreted as your having a maxed-out card. Paying after it reports doesn't help, because the new lower figure doesn't get reported. The company reports again the following month, when your balance is back up.
The way around this is to pay off a bit earlier than usual. Most (not all!) CC companies update to the bureaus on your statement date. If you pay off your balance 4 or 5 days before the statement drops, suddenly your usage ("utilization" or util) looks a whole lot lower.
If you decide to do this, make sure that one card does report a bit less than 10% of its balance. Oddly enough, you lose points for having NO credit card debt. Of course, once it reports, you can go ahead and pay it off.
While this does seem a bit lunatic, it's how to work with the existing scoring formula so that you do get credit for your financial responsibility.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007