You can simply make your ALO files smaller by makign your own meshes instead of what some people *might* do where they clone the hull mesh or some thing like that. When you make your meshes you can use the optimize modifier to keep the poly count down. Also the reason why other conversions are smaller is that they lack things that your model conversions might have,. Every hardpoint, mesh and texture size adds to the export size of the model. Try spending some time to make your own meshes when needing a collison mesh - dont copy it from some thing else in the model. Same with Shadow meshes and shield. cloning will make the models quite big, and high in vertices.