Hi, Tom, welcome to the forums!
You're probably not going to get much score pop for reducing installment util. It's a very small factor in FICO scoring.
The big bank for the buck comes in reducing revolving util. If you carry balances on CC's, or even if you pay them off every month
after the balance posts on your statement, you might be losing points, maybe a lot of them.
The strategy is to pay all but one of your CC's off online 3-4 days before each statement is due to post. When that statement shows a $0 balance, that will be reported to the credit bureaus. Let one card report a small balance ($10-20), because you will lose points for all $0 balances. (Strange but true.)
Timing exceptions: HSBC/ Orchard bank cards and USBank cards report on the last business day of the month, reporting the balance as of that moment. American Express reports the balance on your statement, but they don't send in the info until 4 weeks later, making your reported balances effectively a month behind.
If you haven't already, please read
Understanding Your FICO ® Score and
Credit Scoring 101 (at least the first post.)
These will give you the background knowledge you need to understand what you read here on the forums.
* 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