Have you considered trying out any other speaker cables? In my opinion it could be your weakest link. I had the Rocket 88’s a while ago, then upgraded to AQ’s higher line (higher gauge copper) which produced a far larger range from treble to bass. It made a huge difference. I ended up upgrading to Mont Blancs, Oak, then Thunderbird before decided to go with a full loom of Ansuz cables.
Also, for your interconnects, where do you have the Nordost Blue Heaven connected? Analog or digital? I had Blue Heaven speaker cables in my system and while, to me, it sounded crisp on the highs, it lacked mid-bass and bass. It may be different on interconnects, just something to consider. You have very different types of interconnects, have you tried swapping them around?
Also, for your interconnects, where do you have the Nordost Blue Heaven connected? Analog or digital? I had Blue Heaven speaker cables in my system and while, to me, it sounded crisp on the highs, it lacked mid-bass and bass. It may be different on interconnects, just something to consider. You have very different types of interconnects, have you tried swapping them around?