how in the hell do you do the strat featured in repez's run consistently i've been able to hit the pole vault on the chain ONCE and never again

i did find a failsave/bug though

if you miss the chain completely and go flying off to the bottom of the level, you can spam the pole vault button so that when you respawn, the pole vault carries over

it's enough height to land the shot, albeit much slower than just doing it regularly

so i ask again, how do you pull this strat off more consistently?