Wait until you get all blocks finished. Then see if you can cut all blocks down to the same size. If not, you might want to add some fabric to the edges of the smaller blocks to get them back up to right size. If you use the same fabric, the seam won't show as much where you add the fabric. Hope this helps. You are actually doing fairly well if you are 1/4 inch or less off -- lol. Try harder to keep that 1/4 inch seam. I know its hard, but a really good habit to get into.