Plussound offer a great service, they respond quickly to questions and help with any uncertainties. They also gave me a price for recabling from single to balanced on existing cables (including if I messed up when I did it myself - which fortunately I didn't).
I think a lot will depend on amplification. I noticed a significant difference going to a balanced set up. I got some plus sound silver litz and the improvement was marginal to my ears until I changed the plug to go balanced and then the difference was much greater.
I think it also depends on the quality of the recording and the amplification/source used. I didn't notice a great deal of difference between the white and the modded blue coming directly from my AK120 but when I added the Glove amplification the differences increased. The modded blue became far too sibilant for my taste and I actually prefer the stock blue now.
Successfully fitted Kobiconn to my cables and am now listening to balanced output. The separation is better and the soundstage wider, the actual sound signature doesn't seem to have changed and I'm going to stick with the unmodded blues for a while.
the unmodded blues work really well with the A1, better than the black to my ears and much better than the modded blue. Will try white again shortly but now occupied with the task of fitting a balanced connector to one of my cables...