So far (in 25 years) I have tried different adhesives for everything. I have glued tip overlays with superglue, with epoxy glue and also with wood glue (for hardwood overlays) and I also have fixed the overlays wirh pins through the Horn and the wood. I have had failures with superglue and also with epoxy, especially with very small overlays. With superglue, however, I had significantly more problems.... so I recommended epoxy for the combination of wood with horn. May be I have not used the right super glue?
P.S. if you upholster the strings in the ears properly, you can do without tipoverlays especially with the harder woods such as Osage, Hickory, etc..