What blackhawk said,you can control the crack if you cut the wedge and get the hump in the handle flat. I have sometimes just left it their and tiller around it and I have also tried to bend it out and cracked it right up through the handle. This works pretty sweet if you want to start with a flat even back which is what Gary preaches. I tend not to worry as much about it.
It is easier to tiller one that is flat with no humps and he is usually working with beginners,that is why he wants them flat/longer than most and a little over built,less room for error or chance of breaking.
Pappy