I have been meaning to get to this thread for a few weeks but lost track of where it was until now (thought it was titled something else).  I looked at Isurus oxyrinchus/desori and Carcharodon hastalis teeth I have from the Sharktooth Hill Bonebed (largest sample I have of C. hastalis and where hastalis has a greater size range) and Pyramid Hill Sand (where I. oxyrinchus is present but not C. hastalis).  I agree with you as well.  C. hastalis anteriors are flatter - less of a labiolingual recurv