poor units should be of the militia type, as the combat matrix penalize them in hostile terrains, although they fight not too bad on defense of cities or at home.
famraider can be used for a raiding cavalry yes, the AI will use that for raids. cavalry can do though. Heavy Cavalry need special replacements, so I would use them for elephants instead, and are never used by the AI for recon and raids.
Hofstadter's Law: "It always takes longer than you expect, even when you take into account Hofstadter's law."