Did you grow? I don't remember you being 5'12". Anyway, with a 34" inseam I'd go 57 or 58. The Angus is gonna be a 59 if it's a size up (you do have the 56, right?) with a 57 cm top tube. That's another 1.5 cm longer, and you already run short-ass stems. If you're willing to stretch out a little more, then go for it. Personally, I'd pass.