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.001 or .006 ??

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I've been shooting .001 3d select carbon express 400 arrows 27.25 inches long and just bought some gold tip expedition .006 arrows 27 inches long. The gold tips are shooting broadheads up and right of the 3d's. Would you think the problem is the difference in straightness, the 1/4 inch in length or is there a spine issue?? The 3d's group great and sometimes the GT's will but then they seem to not group so well, i'm not sure what the problem is, anybody had a similar problem?