I just noticed that it looks like my arrow rest is cutting a groove in the bottom of my arrows. I tried to take a picture but it won't show. The marks are on the bottom of the arrow, not against the bow, and are about 3-6" long starting right in front of the fletching. I'm using 4 arrows, spined between 34 and 36#. The heavier arrows are worse(a clue). The rest did have a sharp edge, you can see where I sanded it. My string nock is set at 7/16" above the rest. Could the string nock be a little higher, along with lower spine, maybe. It's a 42# bow.