B&W 703 - How to tame the highs?

Has anyone suggested this yet? Sell the speakers. If you don't like their inherent sound, no amount of tweaking and cabling changes will make you a happier listener.
Speakers is the component that will affect the sound of your system to a largest degree ( next to your room?). No cables change will ever affect the way your system sounds to the same degree as a new speakers.
Regards.

Speakers do not have to be overly warm or inaccurate to play compressed music without ensuing listening fatigue.
There are many better examples to prove the point.
I can mention just one, that I have in my system-
Silverline Bolero. It has Dynaudio Esotar 330 soft dome tweeter, that can hardly be described as "inaccurate".
No listening fatique there. It is very accurate and revealing as well.
If the speaker, B&W in this instance, is giving you listening fatigue- it is not good, don't blame the recording. You are in this hobby to enjoy the music and not to suffer poorly designed components.
The cure- SELL ASAP