Does any of this take into account the Gladiator archetype from Ultimate Combat? It says, "...a gladiator using piecemeal armor is considered to be wearing a suit of armor as long as he wearing two or three armor pieces, gaining the +1 to armor bonus but still taking the +5% chance of arcane spell failure if the pieces are mixed."
I have yet to figure out any two-piece combination that benefits a high Dex build. Am I missing something, or is piecemeal even more flawed when doing a two piece build over a three piece build?