Sled, this is sheep horn.
I have had that issue with bovine horn. I try to select tips that don't have obvious delams going on. If separation appears, then I grab the CA glue. CA glue and horn love eachother. I do avoid setting a nock grove to a depth that puts string stress on a glued horn separation.
Gun Doc, I am going to have to try that apple cider vinegar. I think that would look much better over osage.