Carbon Monoxide is a product of incomplete combustion caused by lack of air in the air/fuel ratio.
Your car is running rich. The high Hydrocarbon reading is unburnt fuel because the engine is not running efficiently.
I would sugest you first try and weaken the mixture.
If you have access to a three gas analyser you want CO as low as Possible, HC as low as possible, CO2 as high as possible, (14.6 being ideal)
Good luck
RDA
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