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If the system is working properly, fans shouldn't be needed at speed. Airflow through the radiator should be more then sufficient.
Mad could be correct, a swirl pot/pressurized overflow would not be a bad idea.
What sort of ducting do you have? Do you have an undertray/splitter?
My guess is that you are not getting proper airflow through the radiator. Enough to keep the intercooler from heat soaking, but not enough for the rad. A few things could cause this. Improper ducting letting too much air pass around the heat exchangers. Improper pressure zones slowing or stopping air from moving through the heat exchangers.
For the radiators to work, you need high pressure in front, and low pressure behind. If you are not running any sort of splitter or undertray, you may be creating a high pressure zone in the engine compartment. This will make it difficult for large amounts of air to pass through the rad.
Just a thought.
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