Every Jacob's Ladder pattern I found was the same...there's one in each of the rows you have so follow that pattern.
I disregard what others do and try to make my row exactly 12 1/2" tall and 60 1/2" wide...when it gets back to the original owner we'll square it up before we add our borders. Everyone's scant 1/4" is just a little bit different from the next person's...it just happens....
Does this help?