Ralph is one of the few manufacturers who will get on Agon and answer questions of all sorts, and sometimes that puts him at odds with some folks. I do not own any of his gear currently, but I highly respect his views and insights and appreciate his input.....and I'll definitely be looking at his Class D amps when i add one, just because of this.....and his reputation.
Try some new cables, build a few cables, see if they work for you; if they don't then at least we've learned something. I am a cable believer, and to my ears they do make an audible difference....especially as my system has gotten more resolving. That's me, with my gear, and my ears......some agree, some disagree.
Maybe it's placebo, but I don't think so. Plus I am LOVING building DIY cables right now, it's meditative and I end up with a product at the end. If I don't love the cable (or it's not better than what I have), I give it to a friend.