AudioQuest vs Cardas XLR

but is there anything out there that will keep my midrange/mid-bass/bass and improve upon the highs? 

So, I have the Acoustic Zen Silver Reference ll interconnects and they offer the sound characteristics you’re looking for.  They won’t shortchange you in the bass or mids, which is surprising for mostly silver interconnects, but they will likely give just a bit more in the highs but without going too far and never harsh sounding.  What may be even better, and much cheaper because they’re used, is this used pair of AZ Absolute Silver interconnects that were at the top of the AZ line and at $750 are less than half their $2000 original MSRP.  My strong recommendation would be to give them a try, and if they don’t blow you away just turn around and sell them for little/no loss as AZ cables have a very fluid used market and are always in demand.  Hey, if they work for you you’ll save a bundle of $$$ with very little risk involved.  Best of luck. 

https://www.usaudiomart.com/details/649955854-acoustic-zen-absolute-silver-one-meter-xlr/

Who cares if they’re made in China? If AQ, Cardas, or whoever is overseeing manufacturing and is standing behind their quality, who give a great God damn where their made? Would I prefer the to be made in the US? Of course!!! But if I can get better cables at half the price that they could be made here, I’m pretty fine with that as long as the parent company is ensuring quality and standing behind their products and they’re not made in a sweatshop, which no reputable US company would do. It’s just economics folks. If relatively low-tech products like audio cables can be reliably produced in countries like China, Viet Nam, South Korea, Singapore, Indonesia, Taiwan, etc. due to lower labor rates then so be it. It’s called global economics folks — get over it. My speakers, that I’ve owned for over 20 years, were designed in America but made in China, and they’re fantastic, built like a brick  house, and would’ve cost double if they were made in the US. In economics, money flows like water to where it meets least resistance. Period. It’s just math. Get over it. If China makes crap products, people in the US won’t buy them and they’ll ultimately fail. Full stop — end of story. But that does not mean that foreign countries can’t produce excellent products for less to our benefit. Look, I’m a Made in the USA dude as much as the next guy, but that doesn’t mean great products can’t be produced elsewhere. And, BTW, to all of you “it needs to be made in the US” guys realize that most of the parts within your “made in the US” audio components COME FROM OVERSEAS!!! Get over it. Support the US when you can of course and I subscribe to that as well, but don’t deny the value that foreign countries can provide even if you don’t like them. Their parts are unavoidably in almost everything we own, so don’t be a hypocrite and think that just because something is assembled here purely benefits the US, because it doesn’t and you’re just fooling yourself. Yeesh.