Comparing a $375 cable to a $3500 cable? No contest. Why do you think Pure Note will best Nordost? In my all tube system the Paragons eliminate the ringing of cymbals, a typical problem with many cables I have owned. Since the Paragons have great transparency, tight bass, ect. they appear to have good control of the signal. The decay you speak of is surreal, IMO, and may not be in the recording.
Also you are trying to make a judgement so soon whereas Pure Note specifically states you need at least 200 hours before critcal listening. Perhaps you should follow this up in a few weeks. It seems like these cables are not a good match for you but if you do a search here you will find many satisfied Pure Note customers.
What other cables have you tried? There are many such as Ridgestreet, Pear, Verastarr, etc.