I have the '54 at your weight and use it for all mountain, since you already have a smaller jibdeck in that lil sk8nana, the '57 would be a good size for a second board.
The 57' will be some work and require more technique to butter for sure, but if you want lazy butters you can do that on your 'nanner.
Support Local Business
"Shop Smart. Shop S-Mart!" - Ash