Iam working with TMS320F280025C + DRV8343 running the BLDC motor at DMC LEVEL 4 using INSTA SPIN FOC, I could find fluctuation in the waveform when the torque of the motor increasing. 
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Iam working with TMS320F280025C + DRV8343 running the BLDC motor at DMC LEVEL 4 using INSTA SPIN FOC, I could find fluctuation in the waveform when the torque of the motor increasing. 
That could be for the current sensing on hardware. You may try to disable the over modulation by setting the value as below to improve the current sensing.
#define USER_M1_MAX_VS_MAG_PU (0.5f)