After reading your review, I'm still not sure what size Proto CT to get for next winter. I'm only 5'9 165 but it seems like people much heavier than me are riding the 157 and enjoying it. 154 just seems a bit too short. I guess in the end 3cm isn't going to make or break the board for me.
I'm much bigger (6', 210 lbs) and I rode the 57 without problems but if I buy one I will probably go to the 160. But like Leo said, 3cm isn't going to make a huge difference especially because it is blunted so it rides like a slightly longer board.