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Hope you're not having problems with the head gasket, do a leakdown test to be sure. You say you're not loosing any coolant; but if there's air in the system then you are loosing coolant somewhere. You can also pressure test your radiator & cooling system to make sure it doesn't have any leaks. They make a tool that attaches like a radiator cap & lets you pressurize with a pump. I believe there is also a test you can do that shows presence of exhaust gasses in the coolant to check for HG leaks.
If the problem only happens in stop and go traffic, you might want to look into the airflow at low speeds. The koyo radiator has a thick fin density that makes it harder for air to pass through at very low speeds. What is your fan setup like?
GL
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