What tilted the balance? The map did not change, so it has nothing to do with it (the only possibility I see is the Aegis having a shorter lifetime, which in theory gives the Dire a very very slight nerf).
As for the side note, most if not all of the variables are largely dismissible on the basis that sides are random. I'm not targeting you specifically, but do you still think this is all random? That there is no specific cause for one side suddenly winning more games?