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What is the year make and model of your vehicle?
Double check that you don't have any vacuum leaks. Have you ever had the catalytic converters replaced?
If you haven't already checked the condition of the distributor cap and rotor I would do that. Double check the ignition timing if you have access to a timing light.
All these little things may get your readings just below the max limit. Based on the hc readings the catalytic converter is worn and replacing that would get those readings down to average.