Super Mario 64: Mario doesn't wall-jump after a sideflip sometimes

Semako

Koopa Troopa
HI everyone :)
I'm doing Mario 64 speedruns and altough I'm just a sub-30 runner, so far from being good, there's one thing which really annoys me: When I try to do a sideflip against a wall to continue with a walljump, Mario sometimes "wall-bangs", saying something like "ugh", and falls back down without walljumping, so that I lose lots of time. Why does this happen? What do I wrong? I really hate to have to reset that often in WF (as wallkicks are used commonly here) even with successful Cannonless...
 
I think it might have something to do with timing of when the wall jump is executed as well as the positioning, if you're a bit off with when you initiate the wall jump Mario kinda awkwardly bounces off of it and falls back down.

 
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