Update:
Have added Text out for:
HitActor Object Name
SpawnDecal Return Value
Spawn Location and Rotation
I’ve been using this to map out a small cube to make sure the info is valid, and sure enough I get a cube halfway into my target, with the right rotation.
Also just grabbed a decal pack from FAB in case it was something wrong with my material, same thing. Madness. 
Note, the Decal does not show up in the world view list, at all. I gave it a lifetime of 60 seconds, let out 40+ shots as a sanity check, nothing.
Like they are instantly destroying
Also, this is being done from a WeaponBP that is spawned inside a characterBP.
Though, I tried it with the characterBP directly and am getting the same results. There has to be some setting I’m missing, something stupid.