Editing explosion effects

I’ve been playing with ALE editing, and I’m working on changing an explosion effect for a missile. I’m using the Drone mine’s explosion as the effect, and it works fine when applied to the missile. Now, what I need to do with it is make it bigger, and speed it up. I’ve played with some obvious stuff in the ALE, but I’m seeing no visible changes in game. Does anyone here know which things I need to change to get what I’m after?