Potato Crop Failure

Underwhelming, isn't it? This is all the yield in potatoes from our 4 barrels. I'd love to know what I did wrong. There were lots of cutworms in the barrels, for one thing.

These potatoes we did get are delicious, and they will make (one batch of) nice potato salad. Still, I was really hoping for, like, 150 pounds of potatoes.

I want to try something similar next year, only with a cylinder of chicken wire instead of a barrel. I'm thinking with more air to the sides, it may do better. Am I wrong or right?