If the shields are made of gravitons and we collapse the gravitons... is there not a risk of creating something quite damaging? Perhaps I don't understand Gravitons correctly....
Never the less! Right, yes, okay... so something to make it all the more boomy... aim for the eye. It'll be the weakest point, as that's likely where all information is seen and given, so it has to have the weakest expanse of shielding because the frequency would be different than the other lasers, since it's a larger laser that comes from it then. If we can hit it directly there, we might be able to keep it from reenergizing those shields. Anywhere else it could borrow from other areas of the shields... I imagine.