I have the same issues with the editor crashing regularly on large maps like these. It's got something to do with my drivers, but I'm not sure exactly what. It makes map editing a pain and is the reason I do terraining at the very last point only, since that's what causes most my issues.
Anyway, your comment about the level 10 creep camps; Are you referring to those at the gold mines? It's easy to overlook, but those are actually ones where I used a trigger to spawn more neutral creeps at game start to bypass the limit. In reality, those creep camps are level 14.
In any case, I've removed the two excess creeps from the 1-2 oclock part you mentioned. That one was a mistake on my part.
Thanks for the reviews!