Experience with high end fuses????

I tried a high buck fuse for power supply in my Exposure 2010s last February it goes in the little tray under the power cord. I was burnt out from comparing things at the time but did switch it out with the stock fuse twice . My gut feeling was the new fuse cleaned things up the image more defined but also made the stage less open and things almost sounded digital and like the top and booom of tan EQ was boosted slightly. I sat down last night and compared and indeed this is the case. As I said the high buck one seems to clean things up but also shrinks the stage and makes the sound almost processed. Has anyone had any real experience with changing fuses?? I guess one would think the manufacture of the amp voiced it with the fuse they wanted in it. keith