Madrigal HPC xlr interconects vs Discovery plus four, or try Wireworld eclipse?

Hi, I have been using Dicovery plus 4 cable with my Bryston pre and amp with good results. Recently I upgraded to a ARC Ref 5 preamp and was not to happy with high frequency extension and was sounding uninteresting. A friend of mine suggested me to try an old Madrigal that was not using and might sell it for a fair price. While It was a much better improvement In high freq, the piano transients can sound at times grainy and a little harsh. Would I be doing better ordering a WW eclipse? The problem is that I can,t try it … live in s suburb in Central America Any other suggestion that does not goes above 500 dlls..Thanks in advance