Thanks Mike - I think that is my usual luthier's point. This dissatisfaction all started with regular trips to the country for work where I stay with a friend with 6 cellos, including two very good cellos. I used to take my cello but decided his were nicer to play anyway. Most people (my previous teacher, my partner, my cello friends) have recommended exactly the same as your last point (trade it in). Funds are lacking at this moment (but one day!)