can there be a softer string than mcs? yes, it is pro's pro hitech multifibre.
i managed to hit yesterday for half an hour with it, but it's too soon to make any statements besides the fact that it was "encouraging". i had it strung with blackout mains and played it parallel with the blackout/mcs combo and a tecnifibre black code/mcs combo.
after stringing i made a measurement with the raquettune and it was 1 point softer than the blackout/mcs combo. you also feel it while hitting. for now the power level is comparable, spin too, i think i have to get used a little bit to the touch of it and slightly adjust in order to have better control, as i felt that i was spraying the shots a little bit more as compared to the blackout/mcs combo.