I've linked the reason why I can never consistently land this jump to that perk. If I change the helmet to one without that perk, I make the jump fine. As soon as I put the helmet back on.. The video happens.
Bear in mind I'm not even touching the left thumbstick throughout the video (except for at the end to flip in frustration). One of my friends pointed the problem out when he got a new helmet and tried it out. He started failing that jump too so I saved videos and put them together. :)
[b]Edit:[/b] A few people have suggested holding backwards on the left thumbsticks in order to make the jump, I can confirm this works. Though I still think the helmet shouldn't decrease your standard momentum like that! S'gotta be a bug, surely?
[b]Another edit:[/b] Thanks for letting me know that you can hold back on the left thumbstick to land the jump, I now do that all the time. I still feel like the initial trajectory shouldn't be altered just from wearing the helmet, we shouldn't have to hold back just to make a normal jump!
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Try reading the whole perk it might give you a clue