mumakil modding question

[Berserker1]

I am trying to make the mumakils more interesting, one when they attack, it should send units flying. I have kind of got it working, but they just go straight up in the air, and then down... Not exactly what I had in mind, also I want to reduce the radius of their attack also, so it looks like the tusks themselves are doing the damage. Here are the following fields, hopefully someone who has worked with this can explain what they do exactly:

radius
x_radius
y_offset
height
bouyancy_offset
root_node_height
dead_radius
tusk_z
tusk_radius

Thanks in advance! I probably could test the values, but my computer is slow, it takes so much time to test anything. But, on Wednesday I should have a new faster computer!

[Berserker1]

bump.