I would shoot longer and see if the results are the same. If your point of impact doesn't change I'd just move your 20 yd pin but if they are all off you may want to move your rest or nock. Have you checked to see if your string may have stretched, or eliminated all other possibilities except for the new broadheads?
If the basic criteria for a vampire is a living entity that sucks the life out of you in order to sustain itself, then I know a few. They tend to hide out in Washington, DC.
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