You cannot compare combo jumps with the stalagmite in center of the Tokotah Courtyard.
The stalagmite is made of inclined sections wall which is an oddity in this game.
Easiest way to test this is to place markers on the ground then once up the stalagmite walls put markers there too. You will see a gap, that gap is the inclination of the wall itself.
For combos now...
Your avvie get stuck I dont deny that but what makes the avvie stuck in mid-air? 2 PLANES which aren't part of same continuous wall. There is some oddities too with some walls that are continuous but with a sharp corner but this isn't common. Let me explain this with an example:
Library Courtyard: Collision wall of the railing and Collision wall of the tent. When you look at the physics, you will see a real sharp corner, just a little wider than an avvie. At rest the avvie will just slide down to the ground. In movement, the avvie just bumps in between 2 planes and if you do it at the right pace, you will eventually get out of it and reach the top of the lowest wall.
For harder combo elevators the space in between walls is a little bit wider, for easier ones well...it is narrower.
And how I know all that? Because of Plasmaclient at the time it was online. Like I said in another thread, the end of plasmaclient was a great lost for me. For 2 months it became my main discovery tool of the cavern. Having 2 computers helped me a lot, since in Plasmaclient you weren't able to see the "usual" effect on walls. Being on uruexplorer at the same time in same age, I was able to see the real effect when using uruexplorer.
On MOULa shard:
Annabelle 03632553 & Sophie (aka STA1) 15112736 - main public avatars
Annabot 209XXXXX - the bot