at one point I owned 2 sets of Transparent Audio Opus MM speaker cables (yes,
two sets of Opus MM speaker cables) when I was bi-amping my VR9SE's back in 2005-2006. later I did get the Evolution Acoustics MM3's and sell off one pair of the Opus MM speaker cables and then upgrade the remaining pair from Opus MM to MM2. and then I tried a set of
Wave Kinetics A10-U8's under each Opus MM2 pod and it did really focus the sound dramatically. the effect blew me away.
so I completely agree with your experience. those Opus MM2 pods really respond to decoupling.
later I switched from the TA Opus MM2 to the Evolution Acoustics DRSC (double run speaker cables) and later upgraded to the TRSC (triple run speaker cables). before you spend money to upgrade your MM2 to V5 you should try and audition the TRSC. the Opus MM2 is a superb sounding speaker cable. but the TRSC might take you further (and put money in your pocket).