Can upgraded power cords help my setup?

Someone / something is most certainly getting things mixed up - I'd like to converse with the senior electrical engineers you're referring to.
After about an hour of discussion, there would certainly be an acknowledgement of proven fundamental scientific principals and properties. It would also be entertaining to let them enjoy some well recorded music while blindly switching power cords in a modestly high end system.

My 2 cents.
Pick your cable manufacture, then look at the used market and go for the highest one in their line up that is within your budget.
Also look at upgrading your outlet and last but not least
for a dollar or two each replace the glass fuses for ceramic ones.

EVERY time I read a power cable or speaker wire thread the same conclusion is drawn-
The o.p. learns to-
 NEVER ask the question ever again because there is no
"correct" answer.

Blockheads are those that speak out about topics, either positively or negatively, without any actual personal experience, almost always citing what un-named "expert" sources have supposedly told them. Like looking in a mirror, aye, helomech? The italics were a nice touch though.

Almost every seller offers an in-home trial audition with a money-back guarantee. Try a couple of the good ones (Pangea is not one of those) and then report back with an opinion that has something to offer other than your indignant and unqualified speculation.

Dave

The most common problem that happens with house AC interfering with audio is DC offset. Yes, you can have DC offset in an AC line. It happens during peak consumption hours. Try this, does your system sound better at certain times of the day? Say early in the morning or late at night? A new power cord will not solve this issue, and compared to what's in your walls a common hospital grade cord is plenty for audio equipment. Like other's have said a PC does not in any way reject the type of "contamination" you would actually hear to get that "pure" power.