QRH,
You were scheduled for a 3:15 break, legally you need to take a minimum 3 hour break, you knew that, whilst a report time may be -1 hour if everything is ready then there is nothing to say you cannot depart 49 minutes after report time.
If you re-reported after a 2:50 break then you knew that you weren't getting the minimum 3 hour break, then you were exercising commander's discretion to do away with the split and increase the allowable FDP by 1:31 for which you need to complete a commander's discretion report, failing that you sharpen your pencil whereas you re-reported at 0145 and you departed at report time + 49 minutes!