BLDC sensors placement
Apparently the hall sensors position is set for CW direction  


Placement of such sensors are direction agnostic as electrical machines are 4quadrant electromagnetic devices.

If this is sensor related I strongly suspect the sensors are wrongly placed. Maybe intentionally biased to provide phase advance in the CW direction (thus phase retard in the CCW direction)

What is more likely is any offset within the controller or wiring of the sensors to the controller is wrong.

Can you state why you think the sensors are wrong