From limited experience..
Yes, it is 'noisy' compared with other LGB stock. - Different motors, and a different configuration.
The weights are there for a reason. - Traction mainly.
IF I were you, I would remove the inner weight. *Check this next bit* From memory, only the outer axle of each power-bogie is actually driven.. So I would leave the weight over the driven axle. - You can check this on rollers, or by running very slowly and lifting one axle off the track.