If im not mistaken the miscstats plugin also shows info in the lower left corner as a colored hud message(usually the multikill/ultrakill phrase). Why dont you find that bit in the plugin and change the csays to show the message in that format rather than in the center. The only thing is the lower left corner messages wont stack like the csay but if you really want to get it out of the center i suggest you go that route. Hope I helped in any way.