What sort of W&B issues do you have with the A321/A346
?
I can recall the amount of aircraft I've had go 'out of trim' on one hand, and it's almost always been down to poor load control.
If you're having an A321/A346 go out of trim on a regular basis you really need to start asking questions. It barely takes a few minutes to check if a flight's going to be out of trim based on the booked figures a few hours before departure, and if it is out of trim it shouldn't be hard to fix