Turn the Screws

I have a Thermaltake DuOrb CPU cooler and when I installed it, I tightened the screws until I felt some tension, but I’m not sure that was the right thing to do. I have a Q6600 CPU and the temp was 34-36 C at 2.4GHz (stock). I overclocked my CPU to 2.8GHz and the temp went up to 38-42 C (idle). If I overclock to 3.0GHz the CPU gets too hot—55-65 C idle. Is there a proper way to tighten a CPU cooler for optimal performance?
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