After 300 posts and all of the logical advice that's been given, I don't think that you're accepting the three apparent possible reasons for your dissatisfaction.
1. Power - you say that an electrician says that your home's wiring is fine. That's not what we're saying. The power draw on your grid has nothing to do with the wiring in your home.
2. Acoustical treatments and speaker position - maybe you need to seriously look into your room and system's setup.
3. Disappearing bass - if you left your components on all of the time you would actually hear what they sound like as the manufacturer intended. If you like the sound when the system is cold but not warmed up, and it's not the power draw, the room's acoustics or the speaker placement, maybe you just don't like the sound of your system and need to change components.
It seems like you have your mind set on one sight, and are not being open to an answer and solution that you don't want to hear or want it to be.
Chuck