After listening to your videos about the cables you recently purchased, it is obvious you seriously need to put some effort into your room acoustics. You may find that the problems you think you have are not from your components, but from your room. No amount of money thrown at caps, cables, amps, and mods will change the fact that your room itself is causing the issues.
Danny Richie "fixes" the Linkwitz Arion loudspeaker
For some time now I have been directing those interested in loudspeaker design to Danny Richie’s GR Research Tech Talk Tuesday videos on YouTube. Here is his latest: an examination of the Linkwitz Arion loudspeaker. You may be asking yourself: if Siegfried Linkwitz is the genius he is touted to be, how is it Danny found the Orion to be lacking, and was able to find solutions for it’s failings? I’ll leave that to you to answer. In the meantime, after watching and listening to this video, you may want to watch all the Tech Talk Tuesday videos. They may just make you a more informed loudspeaker consumer.
https://www.youtube.com/watch?v=hCA-eSPUkJA.