I bare shaft woods constantly. Just dont go back farther then 10 yards until you see what they do. Tune them from there, THEN scoot back. If you broke one at 18 yards, fletching will pull it straight at that distance but it wont stiffen them enough to be in true tune. Up very close, they will still be flying wonky, costing you loads of energy and momentum. You also will be greatly affected by wind, error of release, and errors in form. Bring them into flying relatively straight a little at a time, barely cross the weak line threshold. Then adding fletching will have no noticable shooting difference, and all will be as good as it gets.