Sorry to dig this up, but it's what I want to discuss. [Just curious, which is better: to do this, or make a new thead about something discussed before?]
I was quite interested in this effect, so I started trying things.  I see the popcorn is still there, it just never lasts long.  I changed ParticleSmoke02 (which is the one we want) to have a VERY slow framerate, so in theory that would make the particles be visible longer, right?  But instead they vanish (mid-animation) after a certain short time period.  Fighters are the best example of this.  Capships, it sticks around longer but still not long enough.
So, is there something else I should change, perhaps in tables (that I have not found so far)?  Or like Starman01 asks, is it just in the code?  Perhaps it is proportion to ship size or total hitpoints?