Okay the 417 is tough particularly because Pathology/Psychopath teaches you how to pipeline for like 90% of the game and then there are levels like this that just subvert some of the fundamentals in weird ways. Easy to understand once you see it but you can be blinded by your pipelining experience.
I may start being of the opinion that PP1.5 pipelining is the hardest thing in this game.
I had an absolute blast of a weekend trying to optimize this. 1092 feels really tight to me and should be optimal or hopefully very close to it!
This is such an awesome level because the step count makes this one of the longest levels in the game without it being a tedious long hole level. You are challenged throughout this monster and there are a bunch of good cuts along the way.
Absolute props to Hi19 for this. Its extremely well designed and despite the 352 steps cut I don't think I've circumvented anything major.