Have you tried adjusting your site? Try adjusting your sight small increments at 30 until you hit the bullseye and then shoot at 20 and see where you hit. At 30 yards even a little adjustment might move it over enough and still be able to hit the bullseye at 20 yards. Or it could be your centershot, if it is off it could cause your arrow to go right or left at longer distance. Are you consistently hitting the same spot at 30?
There is alot of small things that will change an arrows flight, things to look for is how much helical you on your vanes epsecially tipped with broadheads, your center shot,
the most important is to make sure your arrow is spined right, I feel you are just tad under. try walk back tuning to get your rest close.
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