Phil, the Nordost cables have all kinds of specs like capacitance, inductance and velocity of propagation which frankly don't matter unless you are listening to signals above 100KHz. If you are listening to signals above 100KHz, then you don't need speaker cables or any audio gear but rather a nice, quiet padded cell.
The most important spec is missing from the Nordost site. That spec is DCR or DC resistance. I've taken the liberty of calculating that DC resistance which consists of 18 parallel strands of 22AWG. The DCR of the Nordost cable is one sixth of the 16 gauge cable you are using. That might sound significant but it's really not at your cable length. The difference is less than two tenths of a dB.
Atmospheric effects will make a bigger difference to your sound than that cable. If you are hell-bent on reducing your DC resistance, get some 8 AWG cable. It will have a lower DCR than the Nordost cable for a much lower price.
