Thanks for the suggestions and yep I figured it out to my satisfaction, as per photos in the 2013 hunting gear thread. Simply by gently filing a bevel on the back edge of each 2″ aluminum sleeve I feel no bump when drawing an arrow over the rawhide-padded shelf and am quite pleased with the way they shoot. Finger crossed that 2″ will be enough to prevent breakage like I suffered last year an inch behind the head, and am fearful may be a character of Sitka spruce when shooting heavy heads. The arrows are built and at this point I’m committed to using them this year, though if I suffer another breakage I fear that’s the end of my spruce experiments, which will be a damn shame since the shafts are so light and can produce such a strong spine that they allow EFOC and an ideal overall weight, comparable to carbon. Thanks again.