The theory motivated flow shear suppression yields reasonable anomalous transport suppression level as one can see from the comparison below. Left panels show results with theory motivated factor with fm_cexb coefficient equal to 1, while the right panels show results with imposed flow shear factor.
DIII-D discharge 132014
DIII-D discharge 132016
DIII-D discharge 132017
DIII-D discharge 132018
The coefficient might need to be increased somewhat (especially in the SOL region).