the 30 or sets i have mounted always show almost the same pattern, no matter how many times i loosen and reset the bases using a stright edge along the side of bases to get them square, i lap the bottom halves to 80 percent contact always
I only own a couple sets, but I lapped mine and they came out just slightly less than these pics. Took it easy and probably could have taken them down a bit further but didn't. Figured they were better than when I got them.