RE: Ever heard of bent ACCs?
Assuming that a.) the bow is tuned, b.) the arrows/heads are true and c.) your form is consistant, the best conclusions I can draw about the "fliers" is that a.) the fletchings are hitting something different than the other arrows or b.) the "fliers" are somehow damaged. A/C/C's and G5's are a quality combination but if the head isn't true to the shaft they might as well be a chunk of flint on the end of a twig.