I have found that often just a quick touch on the back cut or relief will make all the difference in the world. guys should experiment to try to split the point accurately, effects of different angles and how they affect different materials.
you guys will appreciate this....I scored a hougen mag motor AND a set of annular cutters for it up to 1 1/8" with none of it showing much wear for a paltry $250 and it was from a tool liquidator!