One thing it sounds like you are missing is that the pressure plate at (30,19) disables the force arrow at (19,18). So you can keep all the aumtlich alive then reenter the room with them to kill them. You can exit the way you came from instead of through the bombs the second time.
There's another trick to the room that tripped up a lot of people during the race. So just in case that's actually what you are having trouble with here's a hint:
Click here to view the secret text
×If you are having problems with the timer being too tight and the bombs exploding too soon you may have to think outside the box a little.
Click here to view the secret text
×You can disable the timer by pushing the mirror onto the fuse before passing the force arrow.
____________________________
Links to neat forum tools that I always have trouble finding:
Click here to view the secret text