Strange, DG.
You seem to have another experience than I do.
Uptil now, I used to think that I have quite good ears, and well educated listening. Indeed, my former cables were custom made by me (and here I agree that I'm not the guy to recommend for the job), so most probably not the top notch. But when I replaced those with good quality ones, the difference was, as I said, tremendous. No doubt, my cables were a weak component of my set up. No doubt, monitoring on Auratones, I would probably not have jumped that high from my chair. And good news : for the 38 € that I paid my new cables, I consider them as the best pleasure/price ratio investment that I ever did [;)] (not speaking of all the Vienna stuff, of course). The difference was such that I had to redo my latest home made mixings, because I now have quite more bass level, to a point that I consider offensive. Also, my EQ's that were attempting to clear the muddiness in the low mids are left out now, because muddiness no more. To me it is all but placebo, and for what it is worth, I would recommend that long, long before you replace your Line Audio CM3 cardioids with Neumann KM84 ones, replace all your less than ideal cables.
That being said, I can imagine that from one set up to the other, the problems and their optimal solutions can vary wildely.
My next step : room acoustics, long, long before (but for other obvious reasons) I go for the B&W 800 D monitors.