hello there,
i have not got a fukien tea, but to help you with the pruning question, read the next sentence. what i do with my bonsai (chinese elm) is prune the shoots while they are quite thin and they fork. i think you should prune them now, and when they fork, pinch the growing tips and that will hopefully encourage back-budding, then the shoot will thicken. i hope the info posted was helpfull.
good luck,
jaimin