I have the crank puller and luv it BUT how do you know that you are not pulling the 2 crank halves out farther than they should be, believe it or not the crank pin can flex allowing the the crank halves to be slightly pulled father apart than it should be.
Rebuilt cranks can be a .010 or more narrower or wider, when pressing crank halves together the pin will jump a few thousands or more at a time while being pressed together, not just a easy press fit where you can sneak up on a exact number.
That is the whole reason I run a semi-slip fit on 1 bearing so the crank can find it natural center no matter how wide or narrow the crank is.