Particle system flickering/stretching problem

I have a “poison cloud” particle system that I’m trying to set as a child of my game object entities to visually represent a debuff. The particle system itself works perfectly fine and as expected when I test it by itself, but when I have multiple, and/or when I have them moving with other objects, it starts to cause problems some reason.

I recorded a short video for a visual explanation:

For the first 45 seconds you can see how it just seems to unreliably flicker and change between display modes. At 0:55 I show how a single/stationary particle system seems to work fine.

I’ve done lots of Googling and tried many recommendations I’ve seen for particle system flickering but none have fully worked. The only thing that I’ve found to make this reliably not happen is to change my render mode to horizontal or vertical billboard, but this causes the particle system to not look at all how I would like it to.

Here are my renderer settings:
67757-d5gco6v.png

Does anyone have any recommendations on how to address this issue while keeping the normal Billboard render mode?

I’ve been having similar problems ever since upgrading to Unity 5.3.4p3 where they changed lots of things related to particles. Not sure why this works, but one solution I’ve found is to try changing the Order in Layer to 1.