I doubt it' s the correct change. If you were talking 60-80 yards as longer distance then maybe. But 30 yards isn' t long enough to make the kind of difference you' re talking about. It' s more likely a centershot problem, wimpy arrow spine, form problem or a sight that isn' t plumb to the bow.

Tell us about your setup. It might be easier to recommend a fix if we knew where we' re starting from.