Heavy power cord

if power cable is mostly (or completely) in the air then you need a longer power cord, which will keep majority of its weight on the floor.

This is one of the easiest things to test. Simply listen with everything laying on the floor. Then listen with everything propped up off the floor. Literally anything that will hold them up will do. Paper or plastic cups, pieces of wood or plastic, books, carbon fiber, string. Anything. Just try it. Trying and hearing beats guessing and spreading false information, but only by about a million times. In my opinion.

Do this enough with enough different materials, raising to different heights, it pretty quickly becomes apparent the improvement is probably related to electrical charges of some kind. Because of all the materials and shapes and everything the ones that work the best are ceramic insulators, with the insulators with the greatest resistance to static migration working best of all.

This is what is called doing due diligence. As opposed to blindly following along. If you DYODD well enough it may extend to looking up different ceramic insulators in electric parts catalogs and learning they actually have standards by which these things are measured in terms of being able to resist kilovolts of charges migrating along the surface. Sorry but its been a while and I forget some of this. So don't just take my word for it, DYODD. Maybe even compare like I did enough to actually know for sure what you're talking about. For a change.

Funny enough, while playing music for a friend just the other night I removed the insulators letting the speaker cables lay on the floor. Then put them back again. All while the music was playing. He noticed right away. As has everyone I ever did this for. Its not a subtle difference, not at all. Only reason I can think of everyone doesn't know this, they feel better spreading false information than actually trying and finding out for themselves.

Go figure.

Buy a new, better quality outlet. Also do not ever "Bend" a power cable.
They do break. Been there. I employ a fine white string from the TV above in two spots to keep the power cables supported to reduce stress on the outlet and maintain distance from I/C cables. No you can't see the string if you are over 30.

Just curious how much audible difference it made to use the cord. Considering that you might have a 1/0 awg. cable connected to number 10 or smaller gauge romex in the walls. Most homes are lucky to even get past 14 awg. Treatment.

This is one of the easiest things to test. Simply listen with everything laying on the floor. Then listen with everything propped up off the floor. Literally anything that will hold them up will do. Paper or plastic cups, pieces of wood or plastic, books, carbon fiber, string. Anything. Just try it. Trying and hearing beats guessing and spreading false information, but only by about a million times. In my opinion.

Frankly it never crossed my mind to even test this. What I did notice though is that reasonably relaxed (long enough cable, any, actually) sounds better than stretched/tight one. Never experimented with lifting the cord off the ground. It is probable that vibrations from the floor catch the cable. However they can transfer through equipment, too. So, what's best solution anyway? Dampening cable holders, I'd guess?

However the thread was about plug unplugging because of cable weight, right?

I wish all components had removable power cords. I unplug, move, relocate, loan, ... makes it so much easier to move without cords.

so I want something that stays connected but easily disconnects. 

my Cayin A88T integrated amp has a removable power cord, nice connector, but so heavy it could potentially fall out. Now, I push it back so the wall behind keeps it from moving in playing position.

I would think of some kind of cable tie, velcro strap, that you could fasten somewhere on the equipment, and fasten/unfasten to the cord readily.