Encode (level 4 only): https://youtu.be/s3fi3_Xt80k
Was analyzing my WIP last night and tried to think of places where I could save time. You can't do a lot in the first level because of platform cycles, and what I tried in the second level didn't save time.
I found out that using the Cloud Ingot instead of grabbing that one ledge (the one with the archer) in level 4 saved about a quarter second and set out to redo the boss.
Now I'm still unsure on how RNG works in this game, but one of the biggest timesaves I found was hitting the rightmost lever last. That's because there's less distance for the camera to pan during the cutscenes. I also thankfully manipulated Kahmunrah to be on the leftmost plane for the final hit this time.
Quite challenging fight to TAS due to the planes, fire, and RNG, but I'm super glad with the end result and don't regret going back one bit!