First things first (though technically in reverse chronological order), I drag my mist alt down to see The Big Pink. Things go quite well, and I manage to take down the boss in 2:40 mostly just spamming my Silent Nightblade's charge attack, with the occasional fiery atomizer and curse vial to speed things along.
http://www.youtube.com/watch?v=JP-RtRHm08Q
I also took an opportunity while soloing FSC to record the right-hand path in Ashen Armory that nobody ever takes. It's probably good to avoid if you have a lot of lag since you'll likely find yourself warping onto the spikes unexpectedly, but otherwise I can't really see much reason to always go left.
http://www.youtube.com/watch?v=0C3Lz3LHLGE
I'm considering whether I want to extend the multibox series to FSC. I'm definitely not going to multibox the boss stage since that will just be 45 minutes or so of tediously running around polaris spamming. For the rest of FSC it doesn't really change much except for increasing the chances that the slags will survive the spike wheels long enough for me to destroy them first, and decreasing the chances that the silkwings will get trolljan-farted to death in the bottom-right charred court room.
36 zombies on the left
i counted the mobs on the right in ur video, it was pretty much exactly what i woulda guessed
24 zombies + 3 pups + 1 trojan
in ur vid there were 6 green boxes
so in conclusion u have 2 reasons to go left
-less lag/traps
-more monsters(=more crowns)