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Perhaps the radiator is internally clogged in spots, or has enough bent fins to impede airflow through it? Possibly a defective thermostat? Either would cause less than optimum cooling. You can visually check for bent fins. As for clogs, run your hand over the entire surface area of the rad and see if you feel any spots that are relatively cooler than the rest - that's where the clogs will be.
Ducting the radiator so air flows thru rather than around it should help. If either the radiator, its fan or ducting is deficient, you can expect temps to go up as you drive faster, as the engine is working harder and producing more heat.
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