I left your explanation below, but, are you absolutely sure that the center point measures from the valley in? My thinking is it might be on one side, but not on the others. If you have any scraps left, try this: Fold the pinked edges together, and I am betting that the peaks do not line up perfectly with each other ... although, mechanical tools could accomplish what we couldn't <g> ... now, I am just curious! LOL
I may be talking way out of turn here, but the points are the outer edge of the block because of the pinking. When fabric is pinked, it doesn't unravel like a regularly cut fabric...
that is just a thought. I could be wrong.
Now that the quilt is so beautifully completed, it is probably a mute point.
Another thing to consider is: if you are sewing strips together, and you always start at the same end, the fabric starts bowing ... and, I have taken a tip from Eleanor Burns, and I have started cutting strips in half rather than sewing the entire length from selvege to selvege. For whatever reason, the bow becomes more pronounced if you are working with complete lengths.
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The method I used from the book was strip piecing, where the jelly roll strips are sewn together as a 5 strip unit. Those 5 strip units are then cut into smaller strips and these smaller strips are then sewn together to form the blocks. I think a lot of my problem was with the jelly roll strips themselves and their pinked edges (which I really don't like). For some reason, the Moda strips and and layer cakes I've worked with are measured to the center point of the pinking, meaning that the true "edge" of the piece falls between the valley and peak of the pinking. That's a very minute thing, but it makes a difference over several seams. So I think that was throwing me off.