That's a pretty high PWM value... If you have a flyback board or a 3.0 mainboard you should be able to go as low as 30 or 40% depending on the injector, pressure, etc...
2016 WRX STi Limited (current)2001 A4 1.8tqms (donated)1991 GVR4 #1933 (sold)old.dsmregistry.com/detail.php?carid=218 (dismantled)