There was a bug found with the ADC driver in MotorWare, where the proper clock divisor is not being set to properly clock the ADC from the CPU frequency.
This effects both of the previous public releases motorware_1_01_00_05 and motorware_1_01_00_06.
This will be updated in the next release motorware_1_01_00_07 (May/June release).
Until then, you can simply replace the existing adc.c and adc.h files attached to this post into this location:
C:\ti\motorware\motorware_1_01_00_06\sw\drivers\adc\src\32b\f28x\f2806x\
This dramatically increases the angle tracking capability of FAST even further.