One last thing,

ImperialFighter has a point; in fact, the same one I made after him (sorry about that IF): just until recently, it just seemed like the asteroid "farted" on its own.

I would either get rid of the flash (which I know you stated you would not do) or make the smaller asteroid causing it bigger so people can see what is causing the explosion, as well as make the explosion more of a fireball + debris like all of the other asteroid collisions as opposed to a flash. That way it would be more consistent with the rest of the asteroid chase sequence (regardless of added TIEs, chasing space slugs or whatnot).