Hi Dimitris,
Were you able to verify that the 28.0 format for the DC block will be a sufficient workaround? It seems at this point we do not plan to fix this for 5.23 format beyond the 6 bits of precision.
I was able to verify all MSB bits can be set from a range of -1 to - 134,217,728 in powers of -(2^N).
See below.
-JT