Well, Minion/Peddler is usually a strong engine but the presence of a curser and Swindler would put that idea to bed for me. Both are excellent counters for Minion. Given the fact that is no village on the board I wouldn't try to rely on Salvager to clean up any mess, which hurts Minion as well.
Embargo is also a card that can cause confusion. Yeah, believe it or not i think your strategy was pretty sound. The Duke strategy was surely a great idea, because with this Kingdom not only would a Province rush be hampered, there is also a strong chance to be able to three-pile it.
GG