Bronze clutch plates

The Dominator 99 I took over is fitted with bronze/steel clutch plates. (I assume sintered bronze).
Each bronze plate is made up of a steel backing plate with a sintered bronze plate bonded on each side. This made up bronze plate is thicker than the standard fibre plate.
The steel plates between the bronze plates are the standard item.
The sprocket wheel has bronze plates on both sides.
Problems/Points of difference are - 
  -- the weight of the whole assembly is significantly more than the original.
 -- due to the larger thickness of the plates, the outer plate is right at the edge of the sprocket wheel, so the center of gravity of the whole assembly is (slightly) further out. The outer pressure plate has been machined thinner to accommodate the thicker plates.
 -- the clutch is very noisy - plates clattering together
 -- engaging action is more harsh than with fibre plates

I am concerned about (of course) the clutch slip, and the extra bending load on the gearbox shaft and bearings. I would also like to have a quieter, easier clutch

So, does anyone have any experience in using bronze plates. Used for racing I know.

I think I might replace with standard fibre/friction plates except for the sprocket wheel.
I can't think of a problem using a bronze sprocket wheel and 4 fibre plates.