You are already using the same outlet for the amp and torpedo so that should help with the power noise. Good advice there about ground loops also. I noticed a lot of noise with my home setup also and found it was more interference related. I'll link the post below. Good luck!
I'm a P90 fan and I've noticed how electronically noisy a lot of devices are in my home. Switching power supplies, digital interfaces, routers, smartphones, Bluetooth stuff, etc. The one I didn't expect to be the culprit was LED lightbulbs. Holy Schneikies, some of those are noisy.
Most electronic noise can be remedied by distance. If you don't need something on or plugged in for recording, unplug it. It doesn't help that a lot of recording interfaces give off a lot of noise.
The first thing audiophiles do is to remove any indicator LED’s from mains distribution boards.
The second is to replace any switch-mode junk with linear PSU’s.
Keep mains and any voltage-supply cables away from signal cables. If they have to cross, then do so at right angles.
This is a good start.
Go a stage further into single-end shielded mains cables, and balanced signal cables.
Buy a UPS to both isolate you, and to give ripple-free mains at the correct voltage.
If you still have noise, then run your entire recording gear on a separate UPS.
If necessary, use isolation transformers on any soundcard inputs.
Think long and hard about buying a USB cable that is designed purely for audio, on your soundcard.
I recommend the basic Supra cables. They work very well, and are reasonably priced.
Run your soundcard on its own USB bus, never from a hub.
Better than finicky De-oxit everywhere, and a heavy maintenance schedule - just choose silver-coated mains plugs, boards, and cables in the first place. Contact cleaner spray every 6 months.