1) precache any model that would be called upon by the config other than the primary boss.
for example if you are using the cone attack ability and you are calling a different model than the specified boss, precache it. Another example is if you are using the drop ability where you drop a hat or something, precache this non boss model
2) I don't think it makes any difference the order of things, but it has been standard config practice to have the download section at the end of the config...why change??