I'm confused by the others' answers and am wondering if I'm just not understanding the question.
You have concerns about where the points of the blocks meet when you join them, correct? I don't understand how turning the block a quarter turn would solve the problem, because the seams are the same on every block, are they not?
My thought, as I understand the problem, is you could either add sashing, or once you have sewn them together, whack the snot out of the seam allowance with a rubber mallet, which will help tame and flatten the bump.