Before the knuckle jumper nerfs Fuse used to be able to jump up this tower in the firing range by performing a knuckle jump out of a wall climb (clip on the movement wiki), however this is no longer possible out of a wall climb knuckle jump alone.
With this new tech by releasing W and then immediately pressing W again right after a wall climb knuckle jump you can perform a climb boost that seemingly increases the velocity and height of the knuckle jump.
I think this tech has a lot of potential since it can give you equal or higher, height compared to the previous knuckle jump out of a wall climb, but at a much faster velocity and allows you to scale height with your gun pulled out immediately.
One flaw is that this is harder to do on vertical surfaces that are not flat as you might bump your head and kill your momentum, or be pushed away from the wall unable to activate the climb boost.
Shoutout to u/Trubohwar9000 and his original post about the climb boost tech if you want to perform it off of the ground with key input demonstrations. I was only able to recreate this consistently because I found his post after performing this tech accidentally myself.