Why don't turrets do extra damage to champions?
It wouldn't slow down pushing since minions would be unaffected, and it wouldn't cause the same problems as increasing firing rate. And some people would say; but then they'd be to heavy late game. Well i say they won't, but you don't like that, so just have the bonus damage to champs lower over the course of the game. Or something. Either way a 3v2 under turret shouldn't be so ridiculously one sided in the 3's favor. -Edit- Hell, you could even just make it so the first shot is weak; a warning shot; if they don't run, then it starts actually racking up damage instead of the crappy scaling it has now.