What does IOW mean
I read it here..
The 45 degree thing is a bottom limit. IOW, if at the end of the set, the hanger is pointing down more than 45 degrees, it is not as efficient, and you should make your fulcrum either taller or deeper. Reaching and riding the fatigue is the ONLY thing that matters.
You do not have to change if the sets starts with the hanger sticking straight out. That is the way it is supposed to work. The weight should pull the front of the hanger down, to where the hanger is pointing at a 45 degree angles down, at the end of the set. If you need to have the fulcrum a bit deeper in subsequent sets, because this does not occur, you can put a washcloth or something between the fulcrum and your legs to make the fulcrum deeper.