Observations on why EHS doesn't work sometimes

(Copy pasted messages from a chat; edited some lines.)

I have come to, sorta of a conclusion, but not yet fully tested, that aiming downwards and being next to a ledge makes EHS not doable.
Hence why he shoots regularly, (for example) next to the torch that's next to the woodfall boss door.
In other ledges as well.
In the current spot where you do BK skip for woodfall
Getting too close to the ledge will make it not work as well
Aiming downwards like i said, may be a factor
Why, i have no clue
I know we already knew we can't EHS aiming down, but my guess is because of the camera.
When you aim downwards, obviously the camera aims down; if you get close to a ledge, what happens, camera auto aims downward.
I may not be right about this but. Even when you are aiming with the hookshot, although is looking straight ahead, the game knows it needs to aim down when near a ledge or however you want to interpret this.
And if you release both L and Hookshot, it'll hookshot normally and not extended
These are my observations.

(But Gaby how does it work in the platform where the crystal switch is BabyRage) camera doesn't pan downwards,
(But Gaby why doesn't it work in the left platform parallel to it? BabyRage) my guess is , is because of being too close to the deku flower
Hence why in the spot where you do bk skip now, getting too close to flower or ledge, you'll shoot normally.
Now, i might be saying crap and this may not be the reason, but so far, this has been the reasons why EHS doesn't work in some spots of an area.