They curl down right after being watered? But after a few hours look perky? Your plant looks healthy overall, maybe try watering every 48 hours and see if there's a change. Otherwise, maybe some "kelp me kelp you" would help as kelp is often a general plant tonic.
Fabric pots do "air prune" but when i eventually pull out my root ball at harvest there's still always a large root mass...it's almost like root bound in a healthy way, lol. But if you use small fabric pots, like 1-3 gallons and have big plants it still gets a little crowded.