New cooling system, still overheating.

autoxcuda said
You can run pure water. But you ABSOLUTELY MUST run an coolant additive that has lubrication, anti rust, anti electolysis properties.

Your car did not overheat past 200 degrees just because it was running pure water. It got rust buildup and blockage or you still have some inherent cause of your cooling issue. And seems you still have it.
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I had no problems before it overheated in traffic that first time. I think that did me in.
I don't see rust in the passages now. No more brown water. Everything is clear and it still runs hot (albeit it takes a few more mins for it to overheat now).