Nordost Red Dawn revII vs SPM

Red Dawn uses extruded silver over clean copper (and more of it) than the silver-plated Blue Heaven. Maybe the extrusion process results in more transparency in the upper octaves, which may lead to a more ruthlessly-revealing character that doesn't flatter all systems. I'm using RD throughout, and find my satisfaction varies enormously as a function of the software. With great recordings it's wonderful, but....
Before I isolated my CDP with a Neuance platform I was getting pretty fatigued by RD's vivid
portrayal of upper octave junk. I'm still seeking a less-lean IC to switch in for too-bright recordings. I've just tried Harmonic Tech Pro-Silway MkII, and am amazed how similar it sounds to RD! (FYI Note that RD revII speaker cables are approx 13AWG, wheras BH is 16AWG. I think SPM is 12AWG?). Is SPM RCA IC less lean than RD, or should I try something else?

Rackon--thanks for your comments. I wondered about RFI before buying the Nordost, but as my pre/mono ICs are balanced, and the CDP/pre IC is only 1m RCA, and I have an incredibly quiet background, I would doubt that I have RF infiltrant. I think my system's irritants stem from my old CDP (orig Rotel 855). I'm thinking about trying a non-silver RCA on it for some recordings. Any cost-effective ideas? Am getting curious about newer players like the NAIM CD5 or a supposedly-great new Rotel CD/DVD coming soon...so I really don't want to hang a $$$ IC off my old Rotel if the revolution's really here (ha!).
Listened to Kendra Shank's "Wish" last night, and could swear her pianist (Kimbrough) was playing MY Steinway in the room...so it ain't really broke all the time!