Shockwave movement questions

I’ve been trying to get the hang of the new specialization when it comes to combining its movement with zip and jump pad and I have a couple of questions regarding its effects.

1. Does shockwave add any horizontal momentum when jumping from a flat surface or does it only maintain momentum?

2. To maximize jump potential, is it better to just aim straight down, jump and fire, or aim down and behind the player model like in tf2?

3. Finally, if you hit the ground from flight and want to maintain momentum, is it better to just jump right after landing or timing a shockwave to the landing, because I can’t find a difference between the two in the practice range?