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Easy answer is steroids and that there are many ways to create Servitors and many forms of Servitor as well. Some are made with the chance of combat in mind, others (like types of scribes) wouldn't need the muscle mass at all. Each is made with only one task in mind, it can do that task well but not much else. Combat Servitors are made usually to provide cover to the Tech Priests so they will have increased muscle mass and perhaps a ranged weapons. There are also fun ones like the Praetorians (although in some cases they aren't servitors) which are more tank like.

Mars even has some stray Servitors or at least did.