What is known is NO power cord will solve his dimming light VD problem...
Amen to ^that^.
I would be tempted to shove in 12ga and call it a day.
Power Cables and Wall Sockets
Without knowing for certain, it seems to me that power cables can only be as good as the in-home wiring coming to the wall socket. Is it possible that those who use expensive cables have improved the wiring to the socket? Or is the power from most wall sockets normally excellent, but is limited by conventional power cables?