I think Precision Mode is somewhat counter-intuitive as the lowest speed is potentially the hardest to fly.
We hardly ever get days when the wind speed drops below 5mph so flying at 3mph into - or even with - a 20mph wind requires a lot of work by the drone (and pilot) to hold course and speed. At times, my slow flying EVO seemed to be travelling backwards when trying to fly forwards.
So, on reflection, it wasn't too clever of me to try out PM at 3mph on a windy day.