Luxman L505-u/KEF-LS-50/25' Run Speaker Cable

Well I guess the title says most of it, but I'm looking for some speaker cables to replace my Audioquest Type 4s. I'm not hoping to "tame" anything or change the sound in any way other than to improve all of the things the sytem currently does well: timbral accuracy, detail/separation, mid-range and upper mid-range musicality, airy highs, along with upper bass thump and a satisfying--to me at least--bass. It's good, don't get me wrong. But does anyone suggest a cable capable of accentuating all of these things and able to work over long runs?

OK, if I HAD to identify two areas for improvement, I would say better low volume performance--I have to turn it up a bit to hear the sound qualities described above. And sometimes with certain recordings the LS-50s can get shouty, a bit like the "Lowther shout".

Anyway, any ideas or suggestions will be greatly appreciated. Just wondering at this point. Thanks!