Thank you Margo and Barbara for the responses. I never thought to twirl the seams when sewing rows together, but do it all the time for 4 patches.
As I was finishing up my shoo fly block yesterday, the final seams didn't want to easily go towards the 4 patch units and that is what got me thinking about what direction they needed to be pressed. I didn't want to have to go back and press them all the opposite way, when we finally get to the double 9 patch blocks, and found out they wouldn't nest well. I will have to remind myself that the double 9 patch blocks have all the seams going away from the small 9 patch other than the center one, and that should help me while pressing the shoo fly blocks.
The BOM has barely started and I have already learned something new... twirling seams for rows, not just 4 patches.
Margo, the back of your block looks so nice and neat, I hope my blocks can look that good when I'm done with them all.
And if all your blocks are pressed like in your picture, they are exactly like Barbara's blocks, so I don't think you need to change the direction on any of your pressed seams.
Diane in Colorado Springs