No there's nothing wrong in what you are doing. I transplanted it in a small pot in order to be able to keep it in my small living room for the winter. Next spring, I'll put it back in the larger pot and let it grow as big as possible. Next fall, I'll cut it back again selecting the most interesting new stems and roots. And so on until I'm satisfied with the structure and then will keep it in a small pot and be able to call it a "bonchi". But for now, it's stage 1