I stud down the middle now as well.If your looking to gain the all out most traction then stud the outer belts as well,but for me the extra wear and tear it wasnt worth it for me.
Make shure you have as many scratch lines as possible,you dont want the scratch lines lining up,stagger them around so they always have to chew up fresh ice.My 144 pattern (uses outer belts)has 96 scratch lines.Its hard to beat the woody,s gold diggers for wear.