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Heavy warhorses are Str 18, Dex 13, Con 17, Int 2, Wis 13, Cha 6, so I could see mirroring those mental stats, and not dropping Str below 18. They are melee brutes after all.
So maybe Str 18, Dex 14, Con 16, Int 2, Wis 13, Cha 6?