Personally I think the explosion is fine.

When Ady said he was fixing that shot I expected something more showy and was pleasantly surprised.

Once again it looks like it always should have looked like that and doesn't stick out like a sore thumb.

Storywise the bridge section is protected by an energy shield (as ROTJ proves) so that would slow the impact down and reduce the energy of the explosion.

It could just be my eyes but it seems to me that Ady factored that in because the asteroid seems to explode before hitting the bridge pod (which would mean it only got struck by the fragments that penetrated the shield).