Time to upgrade or no

What is your budget for a PC? I can’t speak to the Morrow cable, but at this price point the Pangea AC14XL is very good (I own one) and more revealing than the AC-9 variants. Once you move up to the next level in price and performance, you really start to hear the difference in SQ. A better sense of realism, increased detail, micro-dynamics, and imaging are presented. Also, the differences in sonic signature between manufacturers is easily realised. Audience, Furutech, Shunyata, Tara Labs, just to name a few, offer a significant upgrade in sonics and are  available used in the classifieds.

Morrow is worth a try; I believe they offer a trial period.
In addition to Pangea, at the budget level of good aftermarket cables are Cullen and Signal Cables which offer return policies. Plus, Wireworld offers some affordable cables that IMO are vastly superior.

Please explain; what is the power rating of the 2 channel amp and also the 7 channel. This info will help find a matching PC for each amp.

So, you don't have a mega-amp which needs a heavy gauge power cable. Your Pangea is 7-awg I believe. 10 or 12awg would be adequate for your amps as long as they are  low resistance. 14 gauge is typically used on source components since they have a low current draw.
 

That Pangea is overkill for you; its typically used on very large high current amps. Try and sell it.

PS Audio PerfectWave AC-5... very good for a power amp

Try the Morrow map2, it has very good user reviews.

Cullen...
http://www.cullencable.com/crossover-series/

Wireworld Electra.. low-noise with a black background
https://store.wireworldcable.com/collections/power-conditioning-cords/products/copy-of-electra-7-pow...
Only 12 gauge, but the Electra would be a real upgrade for the 2 channel amp.