You shouldn't import so much useless stuff.
The female grunt for example is complete rubbish, it doesn't add anything to the game but a few kilobytyes.
The orc spearthrower is just a troll spearthrower with another model.
The raptor rider is just a raider with another model.
Etc...
You must create your own units instead of using models for standard units.
Importing a lot of models is very bad for an altered melee, unless you actually need the models: which you don't.