Score dropping specifically due to only high balances

[CreditBob]

From personal experience, your FICO scores can go from a mid 700 to an 800, and drop to the low to mid 600's, just by having high balances on multiple credit card accounts at the same time. And there is no late payments and no derogatory information 

[Jeffster1]

Experian does say that utilization overall and per account can potentially affect credit scores 20% to 30% depending on the scoring model. As you know, high balances on multiple accounts can also invite AA. 

[Thomas_Thumb]

A couple derog free profiles reported Fico score drops in the 100-120 point range by maxing out multiple revolving accounts. These reports were particularly noteworthy because of the low scores achieved: 590s in one situation and 610s in the other. In both cases the files had a short credit history, added multiple new cards, and then maxed out most, if not all, their revolving accounts. The files lacked any installment history.

The good thing for these two is they could bounce their scores to the 700s just by optimizing revolving utilization.

[SouthJamaica]

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@CreditBob wrote:

From personal experience, your FICO scores can go from a mid 700 to an 800, and drop to the low to mid 600's, just by having high balances on multiple credit card accounts at the same time. And there is no late payments and no derogatory information 

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Agreed.