I have replaced all of my stock powercords with DIY cords via Chris VenHaus recipes. I did the first one because the dollar investment was minimal and if it didn't work that well I would not be out very much. I replaced all of the cords because the sonic differences were not subtle, but huge.
It is possible to buy astronomically expensive cords, which I have never done so I cannot address the value of them, but great improvements can be had for under $100 if you don't mind doing a little work.
I don't know if just adding heavier gauge cable will do much for you, you need the right cable. I used Beldon 83802 for all of my cables.
Try a better cord, you won't go back to stock cords again!
It is possible to buy astronomically expensive cords, which I have never done so I cannot address the value of them, but great improvements can be had for under $100 if you don't mind doing a little work.
I don't know if just adding heavier gauge cable will do much for you, you need the right cable. I used Beldon 83802 for all of my cables.
Try a better cord, you won't go back to stock cords again!