Welcome!!
Paying down your cc's to a lower util will help boost your scores, I would go below 50% though! FICO likes to see very low util (less than 10%) (..unless you are me.....FICO hates me below 10% util...long story, won't apply to you though, cause you aren't me!
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You only posted one score, where did you get it? Is it a FICO or FAKO?
If your middle FICO is 665 that is a decent score for mtg. loans. But, other things are considered, such as DTI, salaries, home value, equity, etc. You will need to post any mortgage questions on the mortgage forum, and ShanetheMortgageMan should be able to help!
ALL credit card util is factored together. So, if you have 2 cc's and one is maxed and the other is at 50% util (assuming they have equal credit limits) you are still at 75% util. So, you need to be chipping at all of them.
If you are going to start paying them down w/ your $ from 401K I would pay maybe a little more to the ones that have a really high interest rate!
Can you re-open your cc's that you closed? But, don't use them! Sockdrawer them! Closing them may have hurt your scores, especially if they were positive TL's. If you can get them re-opened you may see an increase in your scores having the positive TL's back!?
This is my opinion! Others may have more suggestions/ideas
takin' it one day at a time