Diff.Power cords with Switch mode amps.

I have a Rowland 8t/with second chassis/power supply upgraded from the battery,to the wonderful switch mode power supply.Contrary to what Rowland had told me("there would be NO audible improvement using differing power cords"),I had found that going from a Marigo PC to the Cardas Golden Ref was a "clearly" audible improvement.I am going straight into the wall,on a dedicated line.

My question revolves around the subject of looking into the new Electraglide Epiphany X cord,as a further possible improvement.I hear SO MUCH about this cord rendering even more performance,from high quality equip,which I have.Any thoughts?Also,please keep to the Electraglide line,as I have some of the older models,which are really wonderful,but am sceptical of spending Epiphany X dollars,unless I can gather enough useable feedback.Thanks,so much!!