I haven't had any issues with delamination. In fact, I find it moderately difficult to even cut the tips in half between the layers using a fresh razor blade. I initial shape them with my HSS tool post blade, then round them off to a perfect shape using a double cut file, all while spinning rather fast in the lathe. Of course different folks experience different things, so maybe i'm just lucky. But I think cutter sharpness is paramount in any tip application. I can use dull cutters & delaminate LePros......and yes I know LePro don't have laminations. I don't think heat is as much issue as a dull blade grabbing the leather & stressing it rather than cutting it. To be totally honest, I don't think I have ever experienced a tip getting warm or hot except to burnish the edges.