Assuming set up is correct, gear noise is usually attributed to the math - basically theres a remainder in the division. If the teeth don't mesh quite right, noise is generated.
One of our competitors makes a similar gearset to one of ours, but they use a different tooth count that is cheaper and easier to produce. These gearsets run 'loose' and make a lot of noise, but work fine. They lose strength because of the vibration and heat buildup (wasted motion), but they're fine for street applications.
Moral of the story: It comes down to comfort...if you can deal with the noise, keep em, if not, my suggestion would be to source an OEM stock replacement in the ratio of your choice.