I must not be sewing or pressing them correctly because in the squaring process usually the amount at the top and bottom of the block that I have to trim is a little larger than in the middle. I think all of the strips were cut correctly. I was doing this using the strip piecing method but I am wondering if maybe it would be better if I just cut each log the size it is supposed to be and sew it together. I also think that squaring up after each row, like Jan suggested, would probably be a good idea. More work but probably worth it in the long run.