We teach our new back judges to start deep enough (18-20 yards) so that they are comfortable with everything in front of them. Read the play and move accordingly to the action in fron of you. KEEP the play in front of you. If this can be done backpedalling, fine. If not, turn and run with the play but work to keep it in front of you.
As far as not throwing the flag on PI until the play is over, you're only asking for trouble. Again, keep the play in front of you, read the action around the receivers that you are responsible for, take enough time to be comffortable with what you saw and then throw the flag. If it's a mental debate with yourself, then you probably don't have a foul
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