Thanks for the comments.
Heck, I did not realize vaults are actually stronger in SVN
In 0.5.2, there are now two sets of obstacles for the vault section, which looks a bit ugly, but should fix the problem for now. Side note: It really does not depend on the angle of view, so I hope it is suitable for beginners.
Kick section: Did you use impulse jumps (release the W key) after the kicks? I think that makes a big difference, and changed the text accordingly.
Also, I have added one of the most unpopular move challenges at the end of the advanced route :p
A teleport to the hub may be nicer than having to fall off or press K, right. Not sure where they should be best placed.
EDIT: Another difference to SVN I have not realized so far: The delay between dashes is longer in vanilla RE, which makes the last bit of the casual path pointless. I have moved it to a sandbox area and fixed a checkpoint problem on the advanced route --> 0.5.3.