I think you just need to run the electric fence around the perimeter of the whole yard and add some more pens! Setup looks good.
I would do that but I'd have to rent some heavier equipment than I own to clear out some of the brush and woods on the left side of the back. I may do it eventually but I ain't adding any more pens. 51 and 3 coops is plenty to keep me busy. I need to scale down a bit too numbers wise.