(Please note that I do not officially represent the Cassini project, JPL, or NASA. Any opinion expressed herein is mine)

Had good view of the roll-wind turn
No good view of other turns or burn
Must talk about total Delta-V, can not decompose or separate turns
Nominal Earth-line Delta-V: 6.57 m/s (43.5*cos(81.3 deg) m/s) +/- 0.288 m/s (1-sigma exec. err.)
Observed Earth-line Delta-V: 6.51 m/s +/- 0.002 m/s (366.1 Hz doppler shift, OD pass-thru) 
0.056 m/s +/- 0.002 m/s smaller than expected Earth-line Delta-V

1-sigma Earth-line components of above: 0.022 m/s (mag.), 0.288 m/s (pointing)
Observed error (0.056 m/s +/- 0.002 m/s) could be due to
a 2.6-sigma magnitude error
OR a 0.19-sigma pointing error (1.3 mrad)
OR a combination of both
We only know the Earth-line _V
Looks like error is mostly pointing