Using sample of electron tracks (see Grigory Nigmatkulov blog) with all distotion correction on (ExB,OShortR,OBmap,OPr13,OIFC,OSectorAlign) and the latest analysis of Tpc survey I plotted
difference  in Tpc Local sector coordinate system between electron track direction and the component of magnetic field for different sectors.
tBX => tX - BX is  phi component and tBY - BY is rho component of the above difference.
I have varied the value of missing OFC resistor in the distortion calculation.
1. Nominal missing resistor R = 1.781 Mohm (http://www.usatlas.bnl.gov/~fisyak/star/Tpc/Alignment/EandB/2D.Short.1.781Mom.png). In this plot I see significant (~0.5 mrad) difference between FF and RFF data samples for west outer sectors in phi (right upper plot).
2. R = 1.5 Mohm (http://www.usatlas.bnl.gov/~fisyak/star/Tpc/Alignment/EandB/2D.Short.1.5Mom.png) the difference is increased upto ~0.6 mrad.
3. R = 2.0 Mohm (http://www.usatlas.bnl.gov/~fisyak/star/Tpc/Alignment/EandB/2D.Short.2.0Mom.png) : ~0.2 mrad.
4. R = 2.5 Mohm (http://www.usatlas.bnl.gov/~fisyak/star/Tpc/Alignment/EandB/2D.Short.2.5Mom.png) : ~ -0.4 mrad (swap sign)
5. R = 2.2 Mohm (http://www.usatlas.bnl.gov/~fisyak/star/Tpc/Alignment/EandB/2D.Short.2.2Mom.png): ~ 0.

From this analysis the value of missing resistor should be 2 or 2.2 Mohm.