after looking at these
the problem is not the calibration pose.
the problem is the CC shape (boy) needs to match better
to match them:
i built temporary k4 accessory (download below)
load "boy" into CC and remove all clothing
drag K4 accessory into cc
adjust the arms legs and torso to match
then delete the K4
save the cc project
and export with male calibration.
* the clothing item will also need to be rotated slightly before skinning
k4 accessory
https://www.mediafire.com/?i2hdfeiujx5aalii would just reshape the CC for you, but i do not own the base mesh pack
.