considering what you are trying to achieve , perhaps using the bi-wire option might be the better tool. Keep this option open
I assume ofcourse that you have eliminated all other possibilities for the problem eg: positioning, room interactions etc
For the price van damme cables are excellent
The van den hul will appear to do the job but after a while you may well realise that you lost a bit of imaging and soundstage in the bargain
There is no substitute to trying various cables
I find it difficult to guess how a cable might sound in your system - never heard the sound of those speakers
Those foam rings (focus rings) that people were talking about a few days ago might be worth trying here - if they are as claimed. Well within DIY capability.