Andrew, what differences have you noticed? I was toying with both sets but went for the 57's after discussing with our club pro, he didn't think that I would notice much difference, if any at all. So I went for the cleaner looks of the 57's as that was what drew me to them in the first place.
I'm surprised you needed the added forgiveness given your handicap! You've got me worried now!
On another note, you've got to love the 57's, beautiful, sleek and shiny, with a perfect blend of forgiveness and playability. Or at least that's my opinion!!