Perhaps before ripping out sheet-rock, drilling new holes, and imagining copper lugs in the fuse box are better than aluminum, rent a power-meter. plug in your amp(s) and see how much current it's actually pulling. Go ahead, crank that volume up to 0.0 db and play Carmina Burana.
Then check if it's within the bounds of the wiring already in place. If it is, then you're in good shape. If your voltage varies a lot, perhaps a conditioner makes sense, but also consider a pure sine-wave UPS which guards expensive equipment against transient spikes and avoids replacing expensive equipment. You can get a nice one that will work for almost any purpose for under $300.