Power cord - 5 ft vs 10 ft ?

depends on how far is your outlet location

A high end cable manufacturer/retailer whose name everyone here would recognize and respect (and name I will not divulge) told me to buy the size I need. He said retailers push the buy at least 2 meter for best sound BS solely for extra profit.  And he listens extensively to his products and does not hear a difference between PC cable lengths.

@hilde45

Reviewed your system pictures and award you the prize of most thoughtful presentation of pictures I’ve ever seen.

Interesting system and took interest in all those dedicated circuits you have.

Thickness of a power cable certainly is important as you indicate do to better noise control via assumed better shielding.

@jasonbourne52 - Have you ever sat side by side with an audiophile that claimed to hear differences in power cords?  I'd be curious to have you paired up with someone for some blind testing that started at the macro end of the audiophile scale where everyone would agree that audible changes would be expected (e.g. similar speakers) and then work down the rabbit hole to see where you jumped off the "I can hear it" train.