I don't understand the comment about the tops being narrow on the Woodchippers. There is as much room across the tops as any bar of the same size. I have them on several bikes now including my tourer and anyone that has tried them is using them now. It's a bar that once you give it a try, you tend to start to use them - on everything.
I find that there are more hand positions available to me with more comfort than any other bar (I have ridden) plus a whole lot of leverage. I would suggest the 31.8mm bar size.
My other bars are or have been Bell Laps, Ritchey Biomax, FSA Compact, and some OEM bar that came on my Scott thats very FSA like.