There's already the pumpkin to weaken towers to make this less likely.
I like the game how it is now - part of your strategy is to encourage kills to go to your carry tower.
I'm with FuzzyEuk.
Managing the EP with placement strategies is a huge part of the game.
But there a some ideas in the room to give the towers an order of attacking (or somethimg in this way - but just ideas, nothing final ).