You could still put some straw on yours even now. Last year I had my soil tested and planted 4 rows of plants. Now I have the most beautiful plants you ever saw. However not one is bigger than a nickel. A caterpillar is just an upholstered worm.
Stressed strawberries produce small fruit and a short season.
Perhaps this is your problem. I'm growing 2 everbearing strawberries in pots. Some of the berries are very mishapen - they look like little bunches of grapes instead of strawberries. But most of the berries are the right shape. The flower that produced them is a composite flower, actually a cluster of many tiny flowers within one group of petals.