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hoping I could get it running smoother and quieter
Have a look at the relationship between chain and sprocket lock ring. Sometimes the chain hits the lock ring if you have a very small sprocket, and that interferes with the meshing and generates a lot of noise. If that's what's happening, you could try a bigger sprocket, a chain with less plate height (e.g. 8-speed dérailleur chain, if the sprocket and chainring are both 3/32") or a better designed lock ring
Who set it up on arrival?