Hi,
Happy New Year to everyone.
Yes I have owned the Nordost QB8 with Qv4 and you would need to try them all together because I never tried the Nordost and CPT products at the same time. Personally I always look at "law of diminishing returns" and if I could find less expensive products to combine with the CPT cords, that is the way I would go.
I have had a 1200 in my system for less than a month and it really took the picture on my 112" screen to a complete different level. Currently I am running my server on an individual CPT cord and I will be playing with individual CPT cords versus the 1200 for the month of January, just to hear the differences.
In regard to audio, I am still experimenting with CPT to see how far I can take CPT but I have found a very nice tweak that takes the CPT product to the next level. I am very impressed with CPT.