Choose any defensive set-up using the available heroes, within resonable limits, of course (meaning no sniper as tank, no slow as wing, all the common sense rules). Keep a defense line for a week and than put up the next and the next after one week… you’ll see, there will be no significant difference in your average number of cups… None of the possible set-ups will keep you above 2700. Also, none will drop you below 2500. So basically there’s no difference who you put in your defense line, as long as you respect some basic rules. To keep above 2700 you need a different set of heroes, including ninjas, Frigg, Odin, BK, Jabber, Finley and a few select others. You want sattisfaction, focus on attack, not on defense. Defense are sitting ducks for other players to kick around.