If it had such a drastic reaction to the first repotting, I think repotting it again in winter is a death sentence if it still has some life in it. Have a little patience, water sparingly and see what happens.
Not sure what happened to my post...
Carol said it. I was thinking the same...Overwatering and repotting.
The Japanese say it takes ten years to learn how to water correctly. It takes 10 minutes to learn how to water one tree. Put your finger in the dirt and if it's moist don't water. I don't water my FT unless it's bone dry.
This little tree is doing what it needs to do and will continue to do so. Nothing anyone can say will change that right now. You're not a bonsai tree whisperer at this point and neither are most (almost all) of us. I suggest getting a copy of the NY Times bestselling book 'The Hidden Life of Trees' to take your mind off of it.
I hope the tree does well but it's important to leave it alone. It needs very little water because of less respiration in winter and lots of other reasons.
Am sincerely wishing you and your tree well.