Light switch and amp

Agree your amp seems very sensitive to the power being fed to it.
Some type of power conditioner might help.
The whole power conditioner thing is a 'can of worms' though.. so do some research before jumping for one.
Power conditioners all have different effects on different systems...
So no one item fits all can apply. A conditioner which works great in one system could totally suck in another.

Yeah I been kind of looking into a conditioner. Its a little scary for someone new to this to spend money on one. So many people think they don't work or do very little.

Really how much do I spend to get one that works? Maybe through music direct so I can return it?

I really just can't get the soundsage right in my room. The soundstage just appreared one night. It was very layered and sound amazing. The amp has great reviews and if I could get the layering and soundstage back I would be in so happy.

I thinking about trying other outlets and another rooms. My current room is small and has a bed a lot of things in it hoping to use another rooms as see if that works.

You got good sound that night because the power grid is less noisy in the middle of the night. The noise you are hearing through the light switch could be coming through any component power cord. If you buy some power conditioner or power regenerator like PS audio, plug your gear into that except for your amp. Plug your amp direct in the wall. Eliminate any cheap power strips.

circuit for amp receptacle and light switch may be tied together & picking up backfeed

One inexpensive part you can upgrade would be the wall outlet.
If it is not a new one already, buy a heavy duty Pass & Seymout 20 amp duplex recepticle from Menards and put it in the wall you drea power for your stereo from.
$3 or so. wel lworth doing.
If you want to go further.. buy one of the "Porter Ports' from Audiogon. they cost about $35 and would also be worth the cost. Or an Acme silver plated.. Also $35.