To my eye, the plants look healthy enough. The curl may be a natural reaction to heat and sun. As the new compost and woody mulch breaks down there may be a nutrient deficiency. Perhaps if you watered with some plant food in a watering can. I would suggest the kind called "bloom booster" with lower nitrogen and higher P and K. There is still enough N to help green growth. I am not sure how often to apply this plant food; maybe once a week for a while.
Wish I had a definite answer but that is my suggestion. Good luck and maybe some better answers will follow.
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