Shunyata Alpha NR "Settling In Process"?

I find Shunyata's are best with mixing with different Shunyata models. They definitely each have a different sound to them in my opinion. 

Right. And the reason they need to be mixed, they aren't really all that good. The list of sonic traits and characteristics is pretty much endless. Its very easy to make something that does a few of them well. Extended top to bottom. Incisive and detailed. 3D imaging. Whatever. This is why we constantly hear guys being impressed by one thing or another. When in fact what should happen is everything is better across the board and so evenly and equally we are overwhelmed and find it hard to say what is the real strength.

What we want is Arnold in his prime, a strength so beautifully proportioned, so awesomely across the board spectacular, that decades later when there's bigger/stronger all over the place we still look back in admiration and wonder.

When you find that then you will be singing a very different tune. I have some Shunyata and so I know. There's a reason I always recommend Synergistic. Ted ain't Arnold. But his wires....

I auditioned Shunyata NR power cords in March 2019 - both Alpha and Delta versions from The Cable Co. Based on notes made during the trial, the Alpha, more so than the Delta, went through a series of changes despite Shunyata’s KPIP tech and The Cable Co.’s pre-delivery run in.

Out of the box, the Alpha NR did not sound good and I preferred the Delta NR power cord to it. The Delta NR sounded good almost immediately though perhaps not all that much improved over a Venom HC I’d been using. The Alpha went from initially dark and rolled off, to too bright with little mid-range until it finally settled after ~100 hrs. At this time, imaging, resolution and soundstage were improved over both the Delta and the Venom HC cords that had been used on the same power amp

The Alpha and Delta cords were returned to The Cable Co. and a Delta NR cord was purchased from them. Later, a used Alpha NR came up for sale on A’gon and I bought it. This used Alpha pc required only about 20 hours of music playing to come alive. Notes from this point: "...[music] really pops - depth, soundstage, vibrancy."

I have the Alpha NR powering up the various amps I run. The Delta NR powers an eTP60 to which various analog pieces are connected.

Hope this helps.

I feel that in some case different equipment needs different types of cables to sound the best they can.

The last thing I would ever do is buy something knowing it "needs different types of cables to sound the best they can."

I have an Alpha NR on my Luxman M900u, and an older Alpha Digital on my McIntosh C47 preamplifier/ dac. 
The Alpha NR replaced a Ztron Cobra. 
Very satisfied with both Alpha pcs. 
Maybe you should try a Sigma NR on your source. It is said it is much better than the Alpha NR, which I doubt but I could be wrong.