those are the same measurements i get. i like that pattern. but when you sew the blocks together, you'll still get a yellow square in the center, right? I would build the block with the yellow square in the center as one piece. the outside colors would still have the same number of seams, but there would be no seams through the center. see the pictures below. if you have questions, please pm me.
showing patches with your cut squares
[ATTACH=CONFIG]219705[/ATTACH]
showing patches with solid yellow
[ATTACH=CONFIG]219706[/ATTACH]