Your blocks are almost matching. Remember that when you quilt it they will move a little bit more and when you wash the quilt you won't be able to tell that they aren't perfect at all.
If it is a wall hanging, I think that adding the strip in between the blocks will distract the eye enough that you won't be able to tell at all. Besides, from a distance you won't be able to tell, you are only noticing it because you are extremely close to the project and working on it with a bird's eye view. Back up a few feet and all your perceived mistakes melt away!