I remember back in my younger years purchasing the kimber kgc, pure silver Interconnects. Out of the box best cable I ever heard. Then after breakin they went bright on me. Stayed away from silver ever since. I find a good hybrid seems to be the ticket for my ears. I have acoustic zen absolute speaker cables and it’s the first cable after many to sound perfect in my system. I get all the air, fabulous midrange and very articulate bass. These became a game changer in my system.
As far as fuses go, I have used some that tamed brightness, but…. They also sounded dull and lifeless. I would not recommend that route. Break in might help, but often I cannot tell if the cable broke in or my ears adjusted. From my years of experience I can tell you suggestions and opinions are not going to get you satisfied. Unfortunately you are just gonna have to try different things and that cost money. Everybody’s ears and systems are different. I still have all the fuses I have purchased. If I knew which one cut the highs I would give it to you for free.