A tip that works for me
I find that moving the phone closer and further away from my face while recognition is happening increases the success rate. Over the period of a second I move the phone from 16 inches to 24 inches and back to 16 inches.
Perhaps its different depending on your face size and/or the calibration distance that you used.
If something like this works better for you please say so ;)
Biting the hand that feeds IT
