Ryan, I tried almost every strat i could think of, This strat is optimal because: You need to save 3rd slowest host before first pause, you need to save engine hostage so that he escapes within 55 seconds(actually i came to think of one thing here, you really onlu need 58'ish hostages for 56 speed run, cause of fade...), anyway, by going catwalk way you gain some time which was necessary to get this run down to 56 seconds(56.9 actually!).
I'm sure improvements are possible, but i'm not sure about 55, a whole sec needs to be saved and run was pretty good up until tracker bug at least(a little lazy TASing after that i know.) You have a good point about the 180 turn SW, i mainly did that to get a better position for door(prolly doesnt matter).And yeah i forgot quickpause, but i dunno where i would've made them? Catwalk guy is way more likely to backboost than to boost.