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.
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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.
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Pappy