I recently took a class on Power Cutting, and the whole thing was about NOT using the cut bigger squares, center mark, two seams, cut apart method. They always come out wonky, no matter how careful I am and how accurate my cutting and pressing and measuring. I am now back to cutting single triangles and sewing together one half square at a time. I just made a quilt to with a bunch of them, and for the first time I didn't have to square up or take apart any HSTs. They are all really good and square.