You are most likely not moving enough air. If there is room, loose the electric fans and get a good engine drive fan with a shroud and most likely your issue will go away. When the air is on the condenser gets hot and pre heats the air that is supposed to be cooling the radiator. If it is good at idle and on the highway without the air on then the cooling system is most likely up to snuff. I would not put 3 fans on anything. The cases of the fans will be blocking a good portion of the radiator surface area and will probably hurt more than they help.
210 is not to hot but the engine should run at +- 10 degrees of the thermostat rating. If not somethin is wrong.
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