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Why are they decreasing? Why can't you buff them? You can buff them very easily, especially since there are Universities, huts, altars, and they can even offer Warfare as a skill. Such a buffed unit will always be 3 levels behind a Barbarian, but will that 3-level difference matter when the hero is level 20? Well, the Archer won't reach Grand Master level, but at least they'll have a spell at their disposal. Moreover, this small disadvantage is more than compensated for by their own mages... After all, it hardly makes sense to take more than one or two buffed units into the final battle.