Agree with this. But at the same time, I have had experience that cables matter when already have the main items down pat. Matching cables with systems need not be expensive.
What would you recommend ?
I never tried DYNS but I have SONUS FABER Signums w/c is also very hard to drive, cables linking them to the amps are VDH "The Wind" (from J.R. also
, a mere 27yrs ago to be exact), they're old kinds but in pure silver, brings out the punch & adds a lightness to the warm side. As for the warmth you want to tame, silver internal cables usually does the job for that than the copper ones. I'm not familiar w/ the QED XT Silver Anniversary if they have pure silver internals I think it would have done the job already.
The Transparent Cable they are recommending would also help probably coz they have those network boxes w/c contains a network of small coils & resistors circuity to smooth out the SQ. The best way is to test trial & error but that's if they allow to lend their speaker cable or maybe bring the speakers to the desired store.