I'm 6'3" and 200. I would use that board for specific conditions, like when there is some decent snow but not like a crazy powder day. I would want a longer board for serious powder, but I've seen someone close to my size carve some nice lines on a B Magic (158W) that were as good if not better than I could on my 161.5 T.Rice.
I think it will just take some getting used to. That board can still hold a damn good edge.