You might want to test 15 to 20 minutes after your addition to make sure that your FC has hit your target.
The target isn't set in stone, so if you find that your FC gets too low, as your FC has been low lately, you might need to target a higher FC so that your FC never gets to the minimum. Your pool is a commercial pool and will have a higher FC demand than residential pools. Your target should be set to a level that by the time you test and add more bleach, that your FC never gets to the minimum. It is safe to swim at and below SLAM level, so don't worry about having a higher target.