Sorry if I'm mistaken, but unless you've changed the definition in 4.12 I do not think that inv walk had any exploits that made it bypass, along with some other legacy blatant features.
If you want to make it look half legitimate without giving you a pretty big disadvantage, you should split apart vertical and horizontal speed, just like the aim assist. When you/your enemy jumps it looks very blatant, the headsnaps somewhat look blatant too.
Of course, anti cheat's won't detect this but staff certainly will ban for it if you use something like 7+ rotation speed as it looks very similar like a killaura in a blatant client.