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When a "vented" bladed head whistles or makes any noticable "pitchy" sound, it is often due the broadhead being misaligned on the shaft or a blade(s) being slightly bent.

However, in that deer still jump in front of moving vehicles that have those "whistlers" mounted on the front bumper, you might consider letting those head whistle.

Yep. Getting the head aligned properly is the only cure I know for a whistling broadhead. I don't know anything about a filing trick. Haven't seen anything at all in the forums about it. At least, not that I recall.