To change unit's size IMPORTANT!

Okay, I shrunk the characters in my map to 50% their normal size. By scaling factor, selection scale, and by collision size, yet he only fits in areas that his larger version can fit in. What enhanced editor could I easily use for making his size small enough to fit into places that are smaller?

I think there is a section(at the bottom) in the mdl file that states the collision sphere(size) of the unit.

I already changed the colision size in the unit editor. But something prevents him still from going through smaller areas. His shadow is still just as big as well.