You could try dual hole 165/137’s. I remember a post by KH awhile back where he was remarking about 137’s for Muni. The dual hole cranks would give you the option of a shorter faster crank with more fluidity, and a longer slower crank with more torque. Of course there is a stated limit to how much abuse the dual hole cranks are supposed to take; so, if you are an extreme rider the single hole option is probably better.