Well, I looked at block 3 and while piling it with blocks 1 and 2, I saw that block 2 was much larger. I knew I had not trimmed the half square triangles down to 3.5 inch blocks, but I had figured it would be ok. Well, every little 1/16th of an inch added up and the block was a good half inch larger than the other two. It became really obvious when I added in block 3. So I ripped it apart (just the square blocks), trimmed them down and put them back together. I feel much better!