To get the perfect Down:

1. Get over 400 velocity on the way to the building

2. Fall straight through onto the stairs.

3. Perform Fast Down Skip (when you land on the rail get a boost from the hop that you landed on)

4. Jump straight down from the Prison section through the next stairwell.

5. On the sharp turn on the way to the 1st set of people, slow down as little as possible and fly through the door.

6. Do not bump on the way to the 2nd set of people.

7. Do not bump on the light on the last straight section.

This run had the 1st, 2nd, 4th and 7th things happen and it was during a full-game run. Fast Down Skip is easier than it sounds but the rest are deceptively hard. If you perform all of this you could likely get 3:30 or lower, this time is still exceptional and will be very hard to beat.