I already posted these in discord, but might as well post here.

Both strats are done on easy difficulty, so no idea how they work on other difficulties due to change in enemy speed. Also note that the enemy behavior seems to change if you reset, so to test the strats on run condition you need to load the last save instead.

Here you want to shoot Jack's leg as you leave the room, because this seems to take him longer to recover compared to shooting his chest for example. Then once you are downstairs shoot before you reach the clock. I don't know if the timing matters too much, since I've tried early and late, seems to work nonetheless.

Once you grab the head you can shoot to make sure Jack notices you, although depending when he dropped down this might not be needed.

After you pass the point where he would normally come through the door, shoot him to make sure he's not following you to the main hall, because then you won't be able to do the shadow puzzle.

As you can see I did four examples, where I just have the aiming reticle away from her. This seems to make her less aggressive/slower, so you can one cycle her. I got each of these first try starting from the mine save point, and haven't failed the one cycle since realizing this, except when I miss the first block altogether. The block timing isn't too precise it seems, as long as you get it. Doesn't have to be last second, although it is a bit faster if it is.

That Evie fight...I don't understand why, but I did a run from the keycards to the end to test if the save file I was using had something to do with the fact that it was working for me every time while not for others. It doesn't work now. so that's useless I guess, have to do more research. But how can you practice anything if you can't even trust that loading from save gives you accurate fight?

Distortion was practicing that for so long yesterday. Further testing is required, but good find.