I dont water when I transplant. Makes the roots seek water in the new soil. I do use moist soil though. I have watered when I transplanted and the soil stayed too water-logged and the plant suffered for 4-5 days. After the dirt dried out the plant begin to look better and was eventually back to normal.

Hmm I missed that you watered and it perked up. If it perks up, then its probably not over watered. I would just see what happens, dont over water.