The problem is that the effects are scaled with the models. The Akama model must have its scaling value higher than 1. What you can do is make it so the effects don't scale with the model, but this has to be done for each model and may cause other problems. There should be a field that says something like "scale projectiles with model" and set it to false (I think, I'll double check and update later)
You can also make the effects into a dummy unit and change it to whatever size you want. Then just have a periodic trigger that moves the dummy to the position of the unit every .03 seconds. Remember to remove leaks though or you will have major lag problems.