Only saw one other post mention this. You could have walked the area in question and gotten every weed. What would you have? Probably an area of your field with 25% of your planted population that is so badly stunted that it wouldn't yield squat.

At the risk of getting eviscerated I have lots of fields where I spray around an end as opposed to squaring it off. The sharper the turn the faster boom speed the lesser the weed control. When I mow around these fields I may hug the beans a little closer than normal.

At times I use rate number 2 which is generally 25% higher but it doesn't always compensate. I think, and I'm officially old (58), you did fine.