Hello
First i do not think any soap product would cause this....i use dr bonners for everything and that's their main goal is being gentle to plants.
By any chance do they perk up if you water them? Cause underwater and overwatering can both cause a droop.
Otherwise I'd be thinking root problems....your heat is good/humidity/ light distance... that to me leaves the roots. Any smell down there? See any brown roots? Maybe watering with a low dose of hydrogen peroxide might be a helpful gentle possibility just to rule things out.
Good luck with the problem solving. Happy growing. ✌️