What snowboard boots have the smallest footprint and are the least bulky?

I recently bought a Burton Clash 160 and have a size 13 boot. Someone already answered my question on here and said that if i got a less bulkier boot it may work. Any boots in particular? I have looked at the Burton Moto 2011. Also he mentioned that I could put pads in my boot to go down a size but this doesnt make sense. Any feedback would help. Thanks guys