Whenever you transplant there’s a bit of shock to the plant. The way I do it is -
Fill pot with grow medium, give it a good wet down. Open the center up where you plan to transplant. Do the transplant and then gently press the medium down around it to make sure everything is making contact.
As for the droop - only happens to me if I over water. If that’s the case, skip watering for a day or only too dress your water if you stick a knuckle in an feel it is too dry.