Can too many components on one outlet affect the sound of an amp?

Yes, the fewer components, the better it sounds.

Yes. And turn off your microwave, dedicated circuits or no. I have 6 dedicated lines, and yet I can hear the microwave. It is not just this house: I heard it when I lived in San Francisco in my apartment, which also had dedicated lines. And I tested the theory out with a couple of audiophiles, who swore their dedicated lines protected them from that. It did not, as they heard within 1 cut of a CD.
And re: The Maestro. I like it too, but despite its naturalness, it lacks a certain ability in dynamic authority and pace and timing. I think it might be that slightly recessed upper midrange.

Using a proper power conditioner reduces the background noise level and improves the dynamics, besides protection from lightening and other hazards. One other thing that I did was lift the ground and do a separate star grounding that goes out of the house into the ground. This I do not recommend to all as it has its serious dangers, but made my system remarkably quiet. Having separate circuits can induce hum at times. 
Having said that, subtle changes in sound with any change may or may not be for your liking as we all hear differently.
thanks,
Giri

giri


  " ...One other thing that I did was lift the ground and do a separate star grounding that goes out of the house into the ground. This I do not recommend to all as it has its serious dangers ..."

Do you mean that your safety ground does not connect to the service panel's ground bus? If so, that is extremely dangerous and absolutely does not meet code, at least in the US.

     Add the wattage rating of everything on your circuit, including lamps, TV's etc. Divide it by 80% (where a breaker trips) of the circuit breaker rating, If you  get under 110 volts, you absolutely need a bigger circuit.

Power conditioners can help, but they mostly try to alleviate losses from inadequate house wiring or an inadequate-for-lousy-house-wiring amp power supply.

Consider what I would have with a 15 amp breaker: My two amps have four 500 watt transformers. That is 2000 watts (plus the preamps, CD, Tuner, etc.).

Take the 12 amps of current available and multiply it by 110 volts, and I need 1320 watts just to fill my 2000 watts of transformers, plus my preamps, tuner(s), turntable, CD player, and other internals in the amps, not to mention lamps, TV's etc.
     A 20 amp circuit yields 1650 watts (80% of 20x110), while a 30 amp circuit yields 2640 watts (80% of 30x110), the bare minimum for my system.  

My amps provide truly spectacular sound for my B&W's, but they require a 30 amp breaker, which was much cheaper than buying an upgraded amp with a $5000 power supply (from Audire or anyone else).

I inherited Classe equipment (Two 350 wpc amps and one 150 wpc x 6 and their preamps). At super loud volumes on a 15 amp breaker they blew away my Audire system, but only when plugged into 15 amp wiring.

When using the 30 amp circuit, I prefered the precise focus of the Audire, plus the really tight bass returned.

I will say admit that the Classe is much more spectacular than the Audire, and it doesn't need a 30 amp circuit, despite the much greater power, but I listen for me, not to impress others with spectacularity.

Plug your system into a dedicated 20 amp outlet for a test and use an extension cord for a power saw. (Return it to Home Depot, if you choose.)

Twenty amp circuits are becoming more common, but most houses use 15 for lighting and wall outlets. It met the code when I was in the business.

For a dedicated 20 amp outlet, use your clothes washer, garbage disposal, garage or exterior outlets on houses under 40 years old.
 
What's it gonna be? A little wire and a $5 breaker or a major investment?

Or just maybe, an extension cord to your washer outlet?