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It is absolutely ridiculous. I have excellent credit score. I reduced total balance on my loans $8000 last couple of months. I was expecting score increase but $14 charge on my AMEX card dropped my FICO score by 8!
Reasoning is even more ridiculous; "You've made heavy use of your available revolving credit."
I've learned to take the "reasons" that come along with score changes with a grain of salt. Sometimes they make sense. Sometimes they don't.
Score changes happen as a result of many moving parts, aging, etc.
My score bops up and down from 5-8 points depending upon whether I let a balance show on 2 credit cards vs. 3.
There are lots of factors.