This chorale seems very well played.
I see what you mean by it being very lengthy. It is a beautiful work though. The organ noises were a bit of a clatter at times. Means you're too rough on the equipment?!
It is a noisy organ at the best of times, being built in 1978 when the vogue was to re-create baroque organs in all aspects including the bad ones. Having said that, I would make less noises if my technique was better still. Also, this was recorded from quite nearby, with a borrowed Tascam recorder, whereas usually I record from a far larger distance so you don't hear as much of the noises.