I've just recently gotten into using a biner block and tag line for longer rappels, and on the 3 pulls I've done so far my rope has suffered heavy damage to the sheath, including a core shot. The damage occurs on the clove hitch. I have an imlay canyon gear 8.3. The rappels in question were on Uturn, Tierdrop, and Lomatium in arches. Dragging the biner block/clove hitch across the sandstone abrades the sheath severely. Is there any way to avoid the rope damage? I imagine if the webbing extended over the lip of the rappel it would mostly avoid the issue, but then it is more dangerous to get on rappel. Also, a fiddlestick or smooth operator would not be ideal because the anchor is laying on the ground, with 5-10 feet before the edge of the drop. Is this just a scenario where more webbing to extend the anchor over the edge is needed? The only solution I've come up with is just taking some athletic/duct tape out and wrapping it around the clove hitch a few times. Should slide pretty good.