Rangeball, I have had a similar dilemma lately in that I have a fairly short draw length (28&quot and prefer to use carbon arrows. This causes my arrows to weigh less than 400 grains which I would prefer to be over for hunting purposes. I have been considering using weight tubes to get this problem solved. I don't know how this will effect the stiffness of the arrows since I am not making the shaft stiffer, but heavier. It does, however, throw off my FOC and I will have to switch to a heavier head, which will effect the spine. It is something I will experiment with after the season, but should be interesting.