I have found most "tweaks" make little if any audible improvement in sound.
Right. So here's what happens, or at least can happen, or at least is what I have actually seen happen. Person starts out not even able to hear something as obvious as the difference between a budget and really good CD player. That was me. Could not hear it at all. Not even a little. Really puzzled me how some could be so weird as to say there was a difference, when clearly there was not. And, they MEASURED the same. So clearly these people were nuts. This was 1990, give or take.
Only I really love music. Gradually dawns on me there really is a difference. There are differences. Became aware. One day guy swaps carbon fiber footers under a speaker. Well now, actually heard a difference. Wife was there, sort of heard it, maybe. One day after doing something like oh say ten times the footer thing she's all wow I didn't think it could sound any better but it does.
So what most likely is going on is the same sound changes are there regardless, only the more skilled listeners pick up on it a lot easier and sooner and at the smaller levels. Or another way to look at it, there is always some gross level at which the improvement is massive enough everyone says wow that's amazing. Everyone. Which I know, because I been there quite some time now. Years.
Well so here's the thing. If you want to get there, or even if just a little better is enough, or even if you just want to get the most out of what you got, the most for the least money, whatever measure it is absolutely does not matter the better you listen the faster you get there. Period.
And so unless you want to try and be happy right where you are, or maybe don't even care- unlikely, and freaking odd beyond strange, considering where you are!- then unless that's the case far from spending your time questioning or justifying not doing anything to get there- like tweaking- you will be a lot better off learning to listen. And paying attention to threads like this and trying the tweaks is one of the best ways to practice.