Jimmi, I've had rose(and other natural shafting) check if I took the bark off too soon. Do you not have that problem?
Mountaineerbowyer, when using natural shoots for arrows be sure to use second year growth or older. First year shoots will make arrows but IMO they are flimsy and don't stay straight.
First year growth on shoots has leaves along the shoot or at the top of it. Second year, small branches grow from a bud below the leaf scars where the first year leaves were. I prefer to harvest shoots in the winter so I know the second year growth ring is fully set down and has matured. These make very good arrows but they take considerable work.
Take a 3/8" open end wrench with you as a gauge to determine the correct size shoots while out cutting.