Fools and Kings guide is brilliant and those tips are total A.
You can also skip lots of normal fights with super jump. Especially the last levels can be done done very easily. This video helped me a lot. It isn't played in Predator settings BUT you can use this as guide and it shows locations of snipers in rain forest. Remember that you can always pause the game and type ImJackCarver for full health and then continue speed run. I skipped many hard parts with speedrun route and typing full health 1-2 times.
Also remember every time you start playing type cheats:
- UnleashHell (if not already active)
And pres Y so you have feral vision all the time. This helps you a LOT.