Just believe the flaps were moved from 30, together with various other actions all accomplished in the last 40 seconds.
Given the situation (and a couple of hours to think it over) the only other thing that could have possibly increased the thrust would have been to knock the bleeds off, but they didn't have time on their side to come up with that one.
Of the things they did the flaps had the most effect, others could have helped but didn't!