What do you think of this power cord?

As I said previously, please read some more books about amps, especially when the speaker load drops to 1 or 2 ohms of impedance at certain frequencies.

Here is some very basic education to start with:
https://geoffthegreygeek.com/speaker-impedance-changes-amplifier-power/

All this is for over-engineering and increasing the safety margins so you can sleep better at nite :)

Reach out to audiogon member Bill, aka Grannyring, he makes great cables at great prices. Sells them under the “accoustic bbq” moniker. You won’t be disappointed.

Cleeds -

Nonsense. The current rating of any appliance is the current rating. I don’t care if you’re talking about a refrigerator, furnace, or audio amplifier. An audio amplifier is typically spec’d to include current draw at idle and maximum power.

Good morning, I completely agree.  Current ratings on labels for items sold in US have plenty of safety factor built in.  True, there is a relationship between speaker load/impedance/frequencies.  But you are not going to trip breakers or start fires based on the music you play - well, maybe some music might :).  Bottom line, if the device came from manufacture with a standard NEMA 5-15 plug (assuming legal/approved US product), it will not exceed 15A period (probably much less).  I have seen too many amps that claim a gazillion watts times 7 channels and still run all day on standard 15A outlet.  The math does not add up.  Manufactures often exaggerate wattage ratings but the ratings on the labels are more realistic and verified by third parties.  Happy Listening!

The power you have going from your panel to your plug is just as important. If you haven’t run dedicated lines to your outlet, upgrading your power cords would be a waste of money IMHO

You didn't mention whether or not you have a power conditioner. I had a very slight hum/buzz with the volume turned up and nothing playing until I got a power conditioner and the noise vanished. It also provides protection form spikes, like lightning hits.

I'd recommend one, and as far as a power cord goes, I think $100-150 is right. According to the cable company, the longer the power cord, the better (opposite of interconnects and speaker cables), but don't make loops out of excess cord as that creates a magnetic field. Try to keep cables from touching each other, especially if running parallel. I have entry level signal,  gutwire and wire world, and they're fine. Just make sure it is flexible. My signal one is thick and hard to maneuver.