Hi Mark, first of let me say great work with the new schedule.
Just one observation from my flight to Detroit from Queen Alia. Granted I've only done it once, and the outbound time was about spot on, however inbound i was back over 2 hours early. I know its only one example but given the predominant wind direction around the globe, (Westerly), I reckon you could probably reduce the block time on the i/b leg by about an hour for starters and see how things go with that. I was using real world winds and they weren't even that strong, only about 40 knots tail on average all the way back.
Keep up the good work. Chris