The feruchemists were much more strategic than the allomancers because they didn't want to get banned. They always wore their bracers under their quiditch robes and were careful to "throw" a couple of plays so that it didn't look to bad. They always used Chromium ferrings as their goal keepers so that they could make miraculous saves. They used steel ferrings for the chasers so that they could make amazing plays, tin ferrings for seekers so they could see the snitch, and pewter compounders for beaters. Nobody ever got in the way of the beaters. The first year the Feruchemists took over quiditch Hogwarts saw the first fatality from a bludger. It wasn't pretty, Neville fainted, Collin Creavies cousin took a photograph, and proffeser Flitwick was so short that he puked because he was so close that he could see all the mess.
Edit :Arg.. I swear I came up with my ideas before seeing Shaggai's post. He ninja'd me.