Integrated Question

Some of the cables above offered more than the Morrow, but when cost was factored in, Morrow was best all around for the money. I have not looked into Acoustic Zen. Just looked at The Cable Company and they carry AZ may rent and give them a try.

No, don’t do that.  If you wanna try them buy the used ones I recommended because if they don’t work out you can sell them for about what you paid for them so very little risk.  It’s almost like a free in-home trial, and they may well address the issues you’re trying to address, and if they do your problem is solved for $650. 

I’d try experimenting with some interconnects before ditching the amp as they may give you the tweaks you’re looking for without having to throw the baby out with the bath water. I’d very highly recommend you try these Acoustic Zen Silver Ref interconnects as they’ll likely tighten up your bass and may also give you a little more upper octave detail and air without sacrificing musicality. If they don’t work out you can turn around and sell them for little/no loss and certainly much easier and cheaper than swapping amps.
https://www.usaudiomart.com/details/650019426-acoustic-zen-silver-reference-2-free-shipping/

Best of luck.