i have a Prestige MP too, hurt my arm badly, because of the stiffness of the material. i put in the best Damper i know the Babolat RVS, and the shock no longer hurts me. But the balance is too much in the middle of the racket, so i need to put something on 3and9 o'clock (just around 2~3gm in total) and some gel under the butt cap, (i guess that's about 4~5gm). Now the balance is right and the Stiffness doesn't hurt anymore.
If one doesn't mind swinging a 355gm racket, A customized Prestige is very good one!