No idea why each guy likes to shoot one way or the other but I have always thought that a lot of target shooters want low let-off is because most of them shoot a hinge/back pressure release and the added pressure helps with activation. I shoot a trigger so the extra pressure does not help me. I actually got better when I went to 90%.Higher letoff is not always a good thing. Deeper in the valley causes a delay in the arrow moving forward.
You will see most target archers will shoot between 18-22# holding weight. But to each his own.
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