Power cord upgrade

Try a WireWorld Silver Electra on your streamer, they are well liked for that purpose.

I just received a Puritan PSM156 last week and have been breaking it in with the Classic+ cord that came with it. I know the Puritans take about two weeks to break in, but after five days of painful listening with terrible, etched highs, I had to swap out the cord for 20A Shunyata I had laying around.  This quickly resolved that problem though it will not be my final cord for that unit. I suspect that the Classic cords are not shielded and that was the issue. So, yes, I would agree that the cord may be holding you back. I was planning on getting their ultimate cord, but now I am a little concerned that I might have the same experience. 

When I had PSM 156 I swapped connectors on classic cord with Furutech rhodium plated FI-28 and FI-32. Made a really nice improvement. 

OP Iam not surprised the Heimdall and Frey will work in favor of AQ . I used AQ storm series on amp and preamp.

Also, OP…don’t buy the puritan ultimate cord without ability to return it. I tried it, gave it few weeks of break in and sold it. It was harsh, thin and fatiguing in my system with all pass labs amplification at the time. I eventually got rid of psm 156 as I found it to be an overall bad fit for my system and I only ran source components off the puritan. 
good luck

Using the Shunyata Denali 6000 v2 I have had great success with both the Shunyata Sigma v 2 and Kubala Sosna Elation power cables.