Sorta necro bump, but I found out that the Zipline Station Charlie SW is also useful for 100%. After getting the etank in the middle of the spider track, head towards the end, then use the same boost-off-spider-track method off the other end into the SW. Walk forward, then morph to fall in front of the door. Walking briefly on the skywalk for 100% saves ~4-5 seconds over taking the spider track all the way to the end then screw attacking to the door. It's funny that this saves about the same amount of time as in any%, but I guess it makes sense since you're rolling across the spider tracks for the majority of the room, rather than walking on the skywalk.
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