This could very likely be shaved down just a little more, but I am very happy with the result.
The trickiest sections in my opinion was the first room, the guy with the ingram can sometimes retreat behind the boxes and ruin the run. The kitchen, the guy with the shotgun will often take cover too soon.
The stairwell after blowing the wall up, making sure to be quick enough to get all of them and jump, while watching health, making sure to get your rounds through the stair slits was frustrating.
After that it is all about reflex and speed. 

This has become my favorite part of the game to sprint through. -Yeti