Well, good news ....
After about a thousand or so i2cget commands and referring to Ericsson docs and to the other working cubes and issuing a hundred or so i2cset commands ... I was able to get all the non working DCDC's up and running again. The dies are hashing away fine once again =)
KNC definitely has some custom configuration of each DCDC going on =-P

I wonder if any registers can be tweaked in the DCDC's for further power effeciency .. I mean these things have hundreds of configurable settings lol! its nuts.