Follow up:
I just wanted to update my situation. After consulting with some trusted experts, I decided to try replacing the stock power cord that came with the Equitech. It was suggested that the small copper conductors in the beldon pc were resonating with more voltage draw. I was pointed toward something with a solid core, so I ordered a JPS Labs Power AC+. This has totally fixed the problem and further opened up the soundstage. It's kind of annoying that I'd have to spend an additional $400 for an expensive power conditioner to be listenable. But, oh well. I'm thrilled with the way things are sounding.
I just wanted to update my situation. After consulting with some trusted experts, I decided to try replacing the stock power cord that came with the Equitech. It was suggested that the small copper conductors in the beldon pc were resonating with more voltage draw. I was pointed toward something with a solid core, so I ordered a JPS Labs Power AC+. This has totally fixed the problem and further opened up the soundstage. It's kind of annoying that I'd have to spend an additional $400 for an expensive power conditioner to be listenable. But, oh well. I'm thrilled with the way things are sounding.