Animation Rigging constraint issue: Multi-Aim not working as expected

I'm working on a runtime rig for a mech and need my lasers to point at targets. I'm using the multi aim constraint for this but it doesn't seem to work as expected once the parent rig is rotated in any direction.

Maybe I'm not using the constraint correctly but in the video I linked below you can see the constraint values in the inspector on the right. Anyone have ideas on this?

Link to video of the issue:

 

bump, I have a similar behavior, almost looks like the rotations are inverted for me... although it's not depending on the rotation of the root for me...

 

I found the answer here. It's all about the "Aim Axis" setting. Have to find the correct axis at head's local space.

 

Wrong "Aim Axis" was the problem for me but changing it in play-mode did nothing.. had to set it in edit-mode first.