Hi Paul, did you try to program the FMC with Alt / Speed constraints ? Normally it is 250KTS @ 10'000 FT but you can define your own constraints. Also do you have some fixed altitude constraints along your descent path ? I usually fly a descent path with some at/below constraints in the beginning then some at/or above near the FAF what I have seen is hight descent profile (but not with CS757 that was more with another company MD11) where it came too high on downwind in VNAV so had to force descent with V/S. Defining some fixed (not above or below) alt constraints along your descent path might help achieving the path you feel is right.