Hmm. Thanks, good replies.
It's funny how my logic goes: yeah 159 so it's more stable, but it's only 3cm less to 156... Surely it can't make that much difference...if I'm going for a 156 then it's only 3cm to a 153...aaannnd I'm on a skateboard.
Think I'll stick with the 156 and see how it goes.
*and drop some weight before I go to New Hampshire*