Congrats on the ESL 11A Knife, nice one mate!
As for speaker cables, I've tried far too many brands/types to list here, across various system setups.. all I can say is having owned and sold various types of speaker systems over the decades, one thing that clearly stood out is the "synergy."
I used to mix and match cables, interconnects, and power cords before but found that there would be something a miss. Then I learned through visiting numerous private demos of dedicated audiophiles who have carefully put together superb systems, have either matched cables closely with the same brand comprising of a complete wiring loom of a particular brand and series of cables, and finishing at a higher point on the speaker cables, since this is the last point of exit of the signal, which then reaches your ears.
Therefore, the power cords were one type of series, the interconnects were matched to the power cords- same series same brand, and finally onto the speaker cables- were higher series within the same brand, and that's exactly what I did!
Since the last significant upgrade on speakers that I did in 2018, which were the CLX's, I slowly built the entire wiring loom based on Nordost cables, and ending with a higher series for the speaker cables. All power cords and interconnects are the Heimdall series 2, and the speaker wire are the Frey2 cables. With my CJ amplification and the CLX's, I've found this particular combination to be superb! There's nothing I would really need to do at this stage in order to gain any further improvements, unless I were to upgrade the monoblocks and all the wiring... which would either be the next series up, Tyr2 or Valhalla cables. Of course the Odin supreme reference series would be outstanding and I've tried them, wow! Truly remarkable but at that price point is something I really don't want to divulge in.
So to answer your question, it all depends on the rest of your gear, especially the main amplifiers, also your room and listening habits. As for my particular custom built setup in this particular room, it's Nordost all the way, afterall its about "making the connection" as their slogan goes.
This may not be to your liking, I wouldn't know but I believe it's better to maintain one particular type of cables within a certain series and go slightly higher ending at the speakers. Just my experience that's all. The synergy is far greater, more neutral and allows more of the music to flow in a purer wave form, plus ML stats are highly revealing, whatever goes in basically comes out!
Cheers and enjoy those fine tunes!
RJ