Moderator is a skirmisher, so being able to deal with heavy units and assault units is pretty much in its wheelhouse. If you need to deal with it, either use artillery or a swarm of raiders. It sounds like it's working as intended.
The only thing I could see as a change to keep it in line with its role but give raiders an easier time dealing with it[*]
is to make its weapon shoot a thin tracer line at the target for .2s-.4s before the shot fires, followed by the shot going out along the tracer line (Example
). This wouldn't affect it against riots and assaults (what it is meant to deal with), but would allow raiders the change to dodge. This might not be a bad idea for Stingers, Penetrators, and Grizzlies as well, but I don't think those units need such a change.
Optionally the tracer line could show up for a second before it stops[*]
, tracking the unit during that second, as a neat visual effect.