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I have the same issue described here. Shroud, spacing, sizing, fluid, thermostat. All else have checked out. I even tried the pushed fan thinking that it will help with airflow at idle but it didn't so I don't suggest this idea. Tried the wetter coolant. Been there, done that with no good results! Mine starts creeping up when in traffic only after 15-30 minutes of not moving much (think HRPT). It starts going up and once it gets to 215 then I open the hood and it stabilizes. I agree this is related to airflow. So short of opening holes in the hood to improve flow I think we need to seriously consider the idea that good 'ol copper radiators may work better than aluminum. I have a 3-Row Champion aluminum sized as big to fit where the stock one was.