Wow, what a great thread. I can't do any of things suggested here due to being a renter, and not sure even how long I'LL be in my current location. But I'm looking to buy an apartment within the next 18 months, and at that point can really investigate an serious power delivery system.
For now I'm lucky I have found in our new place 1 dedicated 20 amp line with only 1 outlet wired to it. (I switched it to Oyaide R1)
When I am an owner, I would also like to try opening the wiring connections to the breaker box, and the breaker connections to the bus themselves, clean them with Progold and coat them very lightly with Quicksilver Gold.
I use Quicksilver on the in wall 10 gauge wire before inserting the wire into the Wall outlet, and when making extension cords, gang boxes, etc.
I can't compare the benefits of using Quicksilver on the power connections, but on the internal connections of an output section of an amplifier, I heard significant improvements after using Quicksilver.