Mods for Muse 100 amp

I'm wondering if anyone has any thoughts on modifying a Muse 100.This one already has the factory upgrades from 1996 and I'm looking to improve the sound,which isn't bad to start with.Really just needs a little smoothing,mostly on the top end.Looking at replacing internal wire with something other than Kimber PBJ(which is a little tizzy on the top,IMHO).How about changing rectifier bridge to something in fast recovery type? And bypassing filter caps? Any clues? Any help is greatly appreciated.