By the way, if you go into productivity pay, you don't get the hourly flying pay as well. So in Feburary for instance if you did 85 hours you would get 83 hours at 45 Dhs and 2 hours at 425 Dhs. Both hourly pay and productivity pay are calculated on scheduled block hours, not on what you actually fly.
Naturally enough the rosters tend to take you as close as they can to the productivity threshold without going over it. They are very good at this. On the Airbus you will almost never see productivity pay, on the 777 it is a little more common.