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More time in rad means that the time the water has to cool off is longer... Just realized that it's kinda hard to explain
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Thats wrong. As ondaedg stated, time in the rad is constant (duh! Have you ever looked at your rad while the system was running and realized there was no water in it? Of course not!)
The peak probably occurs because you're decreasing the delta T between the coolant and the rad. In low flow situations parts of the loop have "cold" water and others "hot". In high flow the entire system was "warm" water. The lower delta T of course decreases the ability of the rad to move heat.