It even works with how the Enterprise was acting pre-Xindi attack. Humanity was actively interfering in the Vulcan-Andorian Cold War in ways that the Romulans couldn't predict and even acted far above their power in brokering various peace deals. It isn't that far out of line to attribute most forms of chaos happening in the area to be the Romulans trying to sow chaos as a way to control the region of space.

Eventually humanity becomes too disruptive that the Romulans have to actively attack humanity in order to regain control of the region, sparking the Earth-Romulan War. Hell, the human assistance in the revelation of Surak's teachings and the subsequent Vulcan revolution be both the trigger that gets the Romulans to go to war and the reason why they don't reveal themselves, since they were hoping to use a Vulcan-Andorian War to weaken Vulcan and open them up to annexation/incorporation with their cousin species's empire.