How are you viewing your CRs? MyFico, annualcreditreport.com, something else?
Having "too many" accounts isn't a bad thing. Having "too many" accounts that were recently opened can hurt, a little, but it sounds like you have established accounts. Closing them won't get them established.
Closing CCs lowers your overall util.
Do you know your CC util? Individual and overall?
Of the accounts you don't recognize, are they adverse?