Log Cabin Re-visited

Earlier this week I was inspired to pull this back out...I laid it out and decided I needed to add one more row to get it to the dimensions I needed so I made these...
Tonight, I suddenly felt a need to look again. After doing a couple calculations on the size of the quilt top and the size of the bed the quilt is intended for, I realized I need to add one column, not one row.

Now, I'm bothered because the design is going to be off-centered if I add a column and I'm unsure what to do. I'm not sure I have enough strips left over to make another eight blocks (a second column plus the one block I need to finish the first column) to re-center the design. I know I don't want to rip it all apart and create another design. So before I attach any more blocks I need to think this through. It definitely needs to be wider to fit the original bed it was intended for. Any thoughts, ideas, or advice would be appreciated.