what do I upgrade?

I agree with several other posters above regarding the dedicated circuits/lines and line-conditioning.

However, I would specifically suggest Foundation Research LC-1 and LC-2 line-conditioners. These are both passive (no current draw onto themselves) and dedicated to one per component (what else would you use with dedicated lines?) and bi-directional filtering (mandatory for those with a digital source).

In addition, I would suggest some serious experimenting with vibration control ie de-coupling v. coupling racking systems, speaker platforms, etc..

Without properly addressing the these absolutely foundational issues, I believe it is simply impossible to realize the full potential of any system.

-IMO

Allen, as a general rule electricians are not electrical engineers and therefore, no not what they speak when it comes to benefits of electrical tweaks.

Everybody has dirty AC and therefore everybody can benefit from properly treated AC, every digital source injects noise back into the wall for other components to pick up, and most any amp requiring a decent amount of current draw will benefit from a dedicated ciruit/line even at lower listening volume levels.

The only advice I would suggest following from your electrician is when it comes to safety as some to many do know about that.

-IMO