| You can stiffen an arrow mainly by decreasing poundage, decreasing pile weight, increasing spring tension in the button or shortening the arrow. Increasing the brace height and adding weight to the 'back end' of the arrow (eg. heavier fletchings and nocks) will also stiffen the arrow slightly. If your bare shaft is hitting within 12" of the fletched group at 50y then you are not too far away from a good tune. I would first of all increase spring tension and look if you can shorten the arrow at all, even half an inch will have a noticable effect. This plus increasing the BH may be all you need. Personally I like to use as heavy a pile as I can so reducing pile weight will help tune the arrow but they will drift more in the wind and not fly as well.
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