Heh, you lost a lot of time with that pause at the top of the ramp. That alone was probably .5. Also, you need to have the hostage obj complete without letting off full speed. You shouldn't have to kill any guards way in the firing range. Your beginnings (to 2nd lift) are about 1 sec slow, so work on leaving the lift in full speed and doing hostage room quicker. 53 isn't hard once you know what it all takes.