Cal old time roll crimp tools came in three types, one gives a nice rounded finish, the second (which it appears you have) gives a squared off finish and the third was a convertible type that can be changed from rounded to square. As far a what I believe you are saying about the center not pushing out toward the edges far enough try adjusting the shot wad column up and down a bit to see if that will give you a cleaner crimp. Without seeing the actual crimp it sounds as if you need to raise the wad/shot column a bit. I try to adjust my shot/wad column so that the overshot card is 1/4 to 3/16 inches but not less than 1/8th inches from the case mouth.
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