I always race against the WR time to set a decent time. This will probably be many seconds away from this time.
Then I race against my own time to improve this. If my time is so good that it becomes really hard to beat, I race against the WR time again to get a better time, which helps mostly.
MK7!! 3DS friend code: 0688 - 5579 - 0994
Also playing DotA2 beta!