The problem with using small numbers like 1,2,3 for your distro is that it's hard to make incremental adjustments. Say you have a guy at 3 and the rest are 1,2,0. If you want to increase his shots a slight amount, the only place to go is 4, which means he all of a sudden has 2x the distro of anybody else.
Using larger numbers will enable you to fine tune a lot more easily.